JUSTICE O'CONNOR delivered the opinion of the Court.
In Aguilar v. Felton, 473 U. S. 402 (1985), this Court held that the Establishment Clause of the First Amendment barred the city of New York from sending public school teachers into parochial schools to provide remedial education to disadvantaged children pursuant to a congressionally mandated program. On remand, the District Court for the Eastern District of New York entered a permanent injunction reflecting our ruling. Twelve years later, petitionersthe parties bound by that injunction-seek relief from its operation. Petitioners maintain that Aguilar cannot be
tBriefs of amici curiae urging reversal were filed for the Becket Fund for Religious Liberty by Kevin J. Hasson; for the Christian Legal Society et al. by Michael W McConnell, Thomas C. Berg, Steven T. McFarland, Kimberlee Wood Colby, and Samuel B. Casey; for the Knights of Columbus by James W Shannon, Jr.; for the National Jewish Commission on Law and Public Mfairs by Nathan Lewin and Dennis Rapps; for Senator Robert F. Bennett by Ronald D. Maines; and for Sarah Peter et al. by Michael Joseph Woodruff and Scott J. Ward.
Briefs of amici curiae urging affirmance were filed for the American Jewish Congress et al. by Norman Redlich, Marc D. Stern, Marvin E. Frankel, David J. Strom, Richard T. Foltin, J. Brent Walker, Melissa Rogers, Robert Chanin, John West, Elliot M. Mincberg, and Judith E. Schaeffer; and for Americans United for Separation of Church and State et al. by Steven K. Green, Julie A. Segal, Steven R. Shapiro, and Arthur
Briefs of amici curiae were filed for the Council on Religious Freedom et al. by Lee Boothby, Walter E. Carson, and Robert W Nixon; for the Institute for Justice et al. by Mark Snyderman, William H. Mellor III, and Clint Bolick; for the New York County Lawyers Association Committee on Supreme Court of the United States by H. Elliot Wales; for the Pacific Legal Foundation by Sharon L. Browne; and for the United States Catholic Conference by Mark E. Chopko, John A. Liekweg, and Jeffrey Hunter Moon. squared with our intervening Establishment Clause jurisprudence and ask that we explicitly recognize what our more recent cases already dictate: Aguilar is no longer good law. We agree with petitioners that Aguilar is not consistent with our subsequent Establishment Clause decisions and further conclude that, on the facts presented here, petitioners are entitled under Federal Rule of Civil Procedure 60(b)(5) to relief from the operation of the District Court's prospective injunction.
I
In 1965, Congress enacted Title I of the Elementary and Secondary Education Act of 1965, 79 Stat. 27, as modified, 20 U. S. C. § 6301 et seq., to "provid[e] full educational opportunity to every child regardless of economic background." S. Rep. No. 146, 89th Cong., 1st Sess., 5 (1965) (hereinafter Title I). Toward that end, Title I channels federal funds, through the States, to "local educational agencies" (LEA's). 20 U. S. C. §§ 6311, 6312.* The LEA's spend these funds to provide remedial education, guidance, and job counseling to eligible students. §§ 6315(c)(1)(A) (LEA's must use funds to "help participating children meet… State student performance standards"), 6315(c)(1)(E) (LEA's may use funds to provide "counseling, mentoring, and other pupil services"); see also §§ 6314(b)(1)(B)(i), (iv). An eligible student is one (i) who resides within the attendance boundaries of a public school located in a low-income area, § 6313(a)(2)(B); and (ii) who is failing, or is at risk of failing, the State's student performance standards, § 6315(b)(1)(B). Title I funds must be made available to all eligible children, regardless of whether they attend public schools, § 6312(c)(1)(F), and the services provided to children attending private schools must
*Title I has been reenacted, in varying forms, over the years, most recently in the Improving America's Schools Act of 1994, 108 Stat. 3518. We will refer to the current Title I provisions, which do not differ meaningfully for our purposes from the Title I program referred to in our previous decision in this litigation. be "equitable in comparison to services and other benefits for public school children," § 6321(a)(3); see § 6321(a)(1); 34 CFR §§ 200.10(a), 200.11(b) (1996).
An LEA providing services to children enrolled in private schools is subject to a number of constraints that are not imposed when it provides aid to public schools. Title I services may be provided only to those private school students eligible for aid, and cannot be used to provide services on a "school-wide" basis. Compare 34 CFR § 200.12(b) (1996) with 20 U. S. C. § 6314 (allowing "school-wide" programs at public schools). In addition, the LEA must retain complete control over Title I funds; retain title to all materials used to provide Title I services; and provide those services through public employees or other persons independent of the private school and any religious institution. §§ 6321(c)(1), (2). The Title I services themselves must be "secular, neutral, and nonideological," § 6321(a)(2), and must "supplement, and in no case supplant, the level of services" already provided by the private school, 34 CFR § 200.12(a) (1996).
Petitioner Board of Education of the City of New York (hereinafter Board), an LEA, first applied for Title I funds in 1966 and has grappled ever since with how to provide Title I services to the private school students within its jurisdiction. Approximately 10% of the total number of students eligible for Title I services are private school students. See App. 38, 620. Recognizing that more than 90% of the private schools within the Board's jurisdiction are sectarian, Felton v. Secretary, United States Dept. of Ed., 739 F.2d 48, 51 (CA2 1984), the Board initially arranged to transport children to public schools for after-school Title I instruction. But this enterprise was largely unsuccessful. Attendance was poor, teachers and children were tired, and parents were concerned for the safety of their children. Ibid. The Board then moved the after-school instruction onto private school campuses, as Congress had contemplated when it enacted Title 1. See Wheeler v. Barrera, 417 U. S. 402, 422 (1974). After this program also yielded mixed results, the Board implemented the plan we evaluated in Aguilar v. Felton, 473 U. S. 402 (1985).
That plan called for the provision of Title I services on private school premises during school hours. Under the plan, only public employees could serve as Title I instructors and counselors. Id., at 406. Assignments to private schools were made on a voluntary basis and without regard to the religious affiliation of the employee or the wishes of the private school. Ibid.; 739 F. 2d, at 53. As the Court of Appeals in Aguilar observed, a large majority of Title I teachers worked in nonpublic schools with religious affiliations different from their own. 473 U. S., at 406. The vast majority of Title I teachers also moved among the private schools, spending fewer than five days a week at the same school. Ibid.
Before any public employee could provide Title I instruction at a private school, she would be given a detailed set of written and oral instructions emphasizing the secular purpose of Title I and setting out the rules to be followed to ensure that this purpose was not compromised. Specifically, employees would be told that (i) they were employees of the Board and accountable only to their public school supervisors; (ii) they had exclusive responsibility for selecting students for the Title I program and could teach only those children who met the eligibility criteria for Title I; (iii) their materials and equipment would be used only in the Title I program; (iv) they could not engage in team teaching or other cooperative instructional activities with private school teachers; and (v) they could not introduce any religious matter into their teaching or become involved in any way with the religious activities of the private schools. Ibid. All religious symbols were to be removed from classrooms used for Title I services. Id., at 407. The rules acknowledged that it might be necessary for Title I teachers to consult with a student's regular classroom teacher to assess the student's particular needs and progress, but admonished instructors to limit those consultations to mutual professional concerns regarding the student's education. 739 F. 2d, at 53. To ensure compliance with these rules, a publicly employed field supervisor was to attempt to make at least one unannounced visit to each teacher's classroom every month. 473 U. S., at 407.
In 1978, six federal taxpayers-respondents here-sued the Board in the District Court for the Eastern District of New York. Respondents sought declaratory and injunctive relief, claiming that the Board's Title I program violated the Establishment Clause. The District Court permitted the parents of a number of parochial school students who were receiving Title I services to intervene as codefendants. The District Court granted summary judgment for the Board, but the Court of Appeals for the Second Circuit reversed. While noting that the Board's Title I program had "done so much good and little, if any, detectable harm," 739 F. 2d, at 72, the Court of Appeals nevertheless held that Meek v. Pittenger, 421 U. S. 349 (1975), and Wolman v. Walter, 433 U. S. 229 (1977), compelled it to declare the program unconstitutional. In a 5-to-4 decision, this Court affirmed on the ground that the Board's Title I program necessitated an "excessive entanglement of church and state in the administration of [Title 1] benefits." 473 U. S., at 414. On remand, the District Court permanently enjoined the Board"from using public funds for any plan or program under [Title I] to the extent that it requires, authorizes or permits public school teachers and guidance counselors to provide teaching and counseling services on the premises of sectarian schools within New York City." App. to Pet. for Cert. in No. 96-553, pp. A25-A26. The Board, like other LEA's across the United States, modified its Title I program so it could continue serving those students who attended private religious schools. Rather than offer Title I instruction to parochial school students at their schools, the Board reverted to its prior practice of providing instruction at public school sites, at leased sites, and in mobile instructional units (essentially vans converted into classrooms) parked near the sectarian school. The Board also offered computer-aided instruction, which could be provided "on premises" because it did not require public employees to be physically present on the premises of a religious school. App. 315.
It is not disputed that the additional costs of complying with Aguilar's mandate are significant. Since the 19861987 school year, the Board has spent over $100 million providing computer-aided instruction, leasing sites and mobile instructional units, and transporting students to those sites. App. 333 ($93.2 million spent between 1986-1987 and 1993-1994 school years); id., at 336 (annual additional costs average around $15 million). Under the Secretary of Education's regulations, those costs "incurred as a result of implementing alternative delivery systems to comply with the requirements of Aguilar v. Felton" and not paid for with other state or federal funds are to be deducted from the federal grant before the Title I funds are distributed to any student. 34 CFR § 200.27(c) (1996). These "Aguilar costs" thus reduce the amount of Title I money an LEA has available for remedial education, and LEA's have had to cut back on the number of students who receive Title I benefits. From Title I funds available for New York City children between the 1986-1987 and the 1993-1994 school years, the Board had to deduct $7.9 million "off-the-top" for compliance with Aguilar. App. 333. When Aguilar was handed down, it was estimated that some 20,000 economically disadvantaged children in the city of New York, see 473 U. S., at 431 (O'CONNOR, J., dissenting), and some 183,000 children nationwide, see L. Levy, The Establishment Clause 176 (1986), would experience a decline in Title I services. See also S. Rep. No. 100-222, p. 14 (1987) (estimating that Aguilar costs have "resulted in a decline of about 35 percent in the number of private school children who are served").
In October and December of 1995, petitioners-the Board and a new group of parents of parochial school students entitled to Title I services-filed motions in the District Court seeking relief under Federal Rule of Civil Procedure 60(b) from the permanent injunction entered by the District Court on remand from our decision in Aguilar. Petitioners argued that relief was proper under Rule 60(b)(5) and our decision in Rufo v. Inmates of Suffolk County Jail, 502 U. S. 367, 388 (1992), because the "decisional law [had] changed to make legal what the [injunction] was designed to prevent." Specifically, petitioners pointed to the statements of five Justices in Board of Ed. of Kiryas Joel Village School Dist. v. Grumet, 512 U. S. 687 (1994), calling for the overruling of Aguilar. The District Court denied the motion. The District Court recognized that petitioners, "at bottom," sought "a procedurally sound vehicle to get the [propriety of the injunction] back before the Supreme Court," App. to Pet. for Cert. in No. 96-553, p. A12, and concluded that "the Board ha[d] properly proceeded under Rule 60(b) to seek relief from the injunction." Id., at A19. Despite its observations that "the landscape of Establishment Clause decisions has changed," id., at A10, and that "[t]here may be good reason to conclude that Aguilar's demise is imminent," id., at A20, the District Court denied the Rule 60(b) motion on the merits because Aguilar's demise had "not yet occurred." The Court of Appeals for the Second Circuit "affirmed substantially for the reasons stated in" the District Court's opinion. App. to Pet. for Cert. in No. 96-553, p. A5; judgt. order reported at 101 F.3d 1394 (1996). We granted certiorari, 519 U. S. 1086 (1997), and now reverse. II
The question we must answer is a simple one: Are petitioners entitled to relief from the District Court's permanent injunction under Rule 60(b)? Rule 60(b)(5), the subsection under which petitioners proceeded below, states:"On motion and upon such terms as are just, the court may relieve a party… from a final judgment [or] order… [when] it is no longer equitable that the judgment should have prospective application."
In Rufo v. Inmates of Suffolk County Jail, supra, at 384, we held that it is appropriate to grant a Rule 60(b)(5) motion when the party seeking relief from an injunction or consent decree can show "a significant change either in factual conditions or in law." A court may recognize subsequent changes in either statutory or decisional law. See Railway Employees v. Wright, 364 U. S. 642, 652-653 (1961) (consent decree should be vacated under Rule 60(b) in light of amendments to the Railway Labor Act); Rufo, supra, at 393 (vacating denial of Rule 60(b)(5) motion and remanding so District Court could consider whether consent decree should be modified in light of Bell v. Wolfish, 441 U. S. 520 (1979)); Pasadena City Bd. of Ed. v. Spangler, 427 U. S. 424, 437-438 (1976) (injunction should have been vacated in light of Swann v. Charlotte-Mecklenburg Bd. of Ed., 402 U. S. 1 (1971)). A court errs when it refuses to modify an injunction or consent decree in light of such changes. See Wright, supra, at 647 ("[T]he court cannot be required to disregard significant changes in law or facts if it is satisfied that what it has been doing has been turned through changed circumstances into an instrument of wrong" (internal quotation marks omitted)).
Petitioners point to three changes in the factual and legal landscape that they believe justify their claim for relief under Rule 60(b)(5). They first contend that the exorbitant costs of complying with the District Court's injunction con stitute a significant factual development warranting modification of the injunction. See Brief for Petitioner Agostini et al. 38-40. Petitioners also argue that there have been two significant legal developments since Aguilar was decided: a majority of Justices have expressed their views that Aguilar should be reconsidered or overruled, see supra, at 214; and Aguilar has in any event been undermined by subsequent Establishment Clause decisions, including Witters v. Washington Dept. of Servs. for Blind, 474 U. S. 481 (1986), Zobrest v. Catalina Foothills School Dist., 509 U. S. 1 (1993), and Rosenberger v. Rector and Visitors of Univ. of Va., 515 U. S. 819 (1995).
Respondents counter that, because the costs of providing Title I services off site were known at the time Aguilar was decided, and because the relevant case law has not changed, the District Court did not err in denying petitioners' motions. Obviously, if neither the law supporting our original decision in this litigation nor the facts have changed, there would be no need to decide the propriety of a Rule 60(b)(5) motion. Accordingly, we turn to the threshold issue whether the factual or legal landscape has changed since we decided Aguilar.
We agree with respondents that petitioners have failed to establish the significant change in factual conditions required by Rufo. Both petitioners and this Court were, at the time Aguilar was decided, aware that additional costs would be incurred if Title I services could not be provided in parochial school classrooms. See App. 66-68 (Defendants' Joint Statement of Material Facts Not In Dispute, filed in 1982, detailing costs of providing off-premises services); Aguilar, 473 U. S., at 430-431 (O'CONNOR, J., dissenting) (observing that costs of complying with Aguilar decision would likely cause a decline in Title I services for 20,000 New York City students). That these predictions of additional costs turned out to be accurate does not constitute a change in factual conditions warranting relief under Rule 60(b)(5). Accord, Rufo, supra, at 385 ("Ordinarily… modification should not be granted where a party relies upon events that actually were anticipated at the time [the order was entered]").
We also agree with respondents that the statements made by five Justices in Kiryas Joel do not, in themselves, furnish a basis for concluding that our Establishment Clause jurisprudence has changed. In Kiryas Joel, we considered the constitutionality of a New York law that carved out a public school district to coincide with the boundaries of the village of Kiryas Joel, which was an enclave of the Satmar Hasidic sect. Before the new district was created, Satmar children wishing to receive special educational services under the Individuals with Disabilities Education Act (IDEA), 20 U. S. C. § 1400 et seq., could receive those services at public schools located outside the village. Because Satmar parents rarely permitted their children to attend those schools, New York created a new public school district within the boundaries of the village so that Satmar children could stay within the village but receive IDEA services on public school premises from publicly employed instructors. In the course of our opinion, we observed that New York had created the special school district in response to our decision in Aguilar, which had required New York to cease providing IDEA services to Satmar children on the premises of their private religious schools. 512 U. S., at 692. Five Justices joined opinions calling for reconsideration of Aguilar. See 512 U. S., at 718 (O'CONNOR, J., concurring in part and concurring in judgment); id., at 731 (KENNEDY, J., concurring in judgment); id., at 750 (SCALIA, J., joined by REHNQUIST, C. J., and THOMAS, J., dissenting). But the question of Aguilar's propriety was not before us. The views of five Justices that the case should be reconsidered or overruled cannot be said to have effected a change in Establishment Clause law.
In light of these conclusions, petitioners' ability to satisfy the prerequisites of Rule 60(b)(5) hinges on whether our later Establishment Clause cases have so undermined Aguilar that it is no longer good law. We now turn to that inquiry.
III A
In order to evaluate whether Aguilar has been eroded by our subsequent Establishment Clause cases, it is necessary to understand the rationale upon which Aguilar, as well as its companion case, School Dist. of Grand Rapids v. Ball, 473 U. S. 373 (1985), rested.
In Ball, the Court evaluated two programs implemented by the School District of Grand Rapids, Michigan. The district's Shared Time program, the one most analogous to Title I, provided remedial and "enrichment" classes, at public expense, to students attending nonpublic schools. The classes were taught during regular school hours by publicly employed teachers, using materials purchased with public funds, on the premises of nonpublic schools. The Shared Time courses were in subjects designed to supplement the "core curriculum" of the nonpublic schools. Id., at 375-376. Of the 41 nonpublic schools eligible for the program, 40 were "'pervasively sectarian'" in character-that is, "'the purpos[e] of [those] schools [was] to advance their particular religions.'" Id., at 379.
The Court conducted its analysis by applying the threepart test set forth in Lemon v. Kurtzman, 403 U. S. 602 (1971):"First, the statute must have a secular legislative purpose; second, its principal or primary effect must be one that neither advances nor inhibits religion; finally, the statute must not foster an excessive government entanglement with religion." 473 U. S., at 382-383 (quoting Lemon, supra, at 612-613) (citations and internal quotation marks omitted).
The Court acknowledged that the Shared Time program served a purely secular purpose, thereby satisfying the first part of the so-called Lemon test. 473 U. S., at 383. Nevertheless, it ultimately concluded that the program had the impermissible effect of advancing religion. Id., at 385.
The Court found that the program violated the Establishment Clause's prohibition against "government-financed or government-sponsored indoctrination into the beliefs of a particular religious faith" in at least three ways. Ibid. First, drawing upon the analysis in Meek v. Pittenger, 421 U. S. 349 (1975), the Court observed that "the teachers participating in the programs may become involved in intentionally or inadvertently inculcating particular religious tenets or beliefs." 473 U. S., at 385. Meek invalidated a Pennsylvania program in which full-time public employees provided supplemental "auxiliary services"-remedial and accelerated instruction, guidance counseling and testing, and speech and hearing services-to nonpublic school children at their schools. 473 U. S., at 367-373. Although the auxiliary services themselves were secular, they were mostly dispensed on the premises of parochial schools, where "an atmosphere dedicated to the advancement of religious belief [was] constantly maintained." Meek, 421 U. S., at 371. Instruction in that atmosphere was sufficient to create "[t]he potential for impermissible fostering of religion." Id., at 372. Cf. Wolman v. Walter, 433 U. S., at 248 (upholding programs employing public employees to provide remedial instruction and guidance counseling to nonpublic school children at sites away from the nonpublic school).
The Court concluded that Grand Rapids' program shared these defects. 473 U. S., at 386. As in Meek, classes were conducted on the premises of religious schools. Accordingly, a majority found a "'substantial risk'" that teachers-even those who were not employed by the private schools-might "subtly (or overtly) conform their instruction to the [pervasively sectarian] environment in which they [taught]." 473 U. S., at 388. The danger of "state-sponsored indoctrination" was only exacerbated by the school district's failure to monitor the courses for religious content. Id., at 387. Notably, the Court disregarded the lack of evidence of any specific incidents of religious indoctrination as largely irrelevant, reasoning that potential witnesses to any indoctrination-the parochial school students, their parents, or parochial school officials-might be unable to detect or have little incentive to report the incidents. Id., at 388-389.
The presence of public teachers on parochial school grounds had a second, related impermissible effect: It created a "graphic symbol of the 'concert or union or dependency' of church and state," id., at 391 (quoting Zorach v. Clauson, 343 U. S. 306, 312 (1952)), especially when perceived by "children in their formative years," 473 U. S., at 390. The Court feared that this perception of a symbolic union between church and state would "conve[y] a message of government endorsement… of religion" and thereby violate a "core purpose" of the Establishment Clause. Id., at 389.
Third, the Court found that the Shared Time program impermissibly financed religious indoctrination by subsidizing "the primary religious mission of the institutions affected." Id., at 385. The Court separated its prior decisions evaluating programs that aided the secular activities of religious institutions into two categories: those in which it concluded that the aid resulted in an effect that was "indirect, remote, or incidental" (and upheld the aid); and those in which it concluded that the aid resulted in "a direct and substantial advancement of the sectarian enterprise" (and invalidated the aid). Id., at 393 (internal quotation marks omitted). In light of Meek and Wolman, Grand Rapids' program fell into the latter category. In those cases, the Court ruled that a state loan of instructional equipment and materials to parochial schools was an impermissible form of "direct aid" because it "advanced the primary, religion-oriented educational function of the sectarian school," 473 U. S., at 395 (citations and internal quotation marks omitted), by providing "in kind" aid (e. g., instructional materials) that could be used to teach religion and by freeing up money for religious indoctrination that the school would otherwise have devoted to secular education. Given the holdings in Meek and Wolman, the Shared Time program-which provided teachers as well as instructional equipment and materials-was surely invalid. 473 U. S., at 395. The Ball Court likewise placed no weight on the fact that the program was provided to the student rather than to the school. Nor was the impermissible effect mitigated by the fact that the program only supplemented the courses offered by the parochial schools. Id., at 395397.
The New York City Title I program challenged in Aguilar closely resembled the Shared Time program struck down in Ball, but the Court found fault with an aspect of the Title I program not present in Ball: The Board had "adopted a system for monitoring the religious content of publicly funded Title I classes in the religious schools." 473 U. S., at 409. Even though this monitoring system might prevent the Title I program from being used to inculcate religion, the Court concluded, as it had in Lemon and Meek, that the level of monitoring necessary to be "certain" that the program had an exclusively secular effect would "inevitably resul[t] in the excessive entanglement of church and state," thereby running afoul of Lemon's third prong. 473 U. S., at 409; see Lemon, 403 U. S., at 619 (invalidating Rhode Island program on entanglement grounds because "[a] comprehensive, discriminating, and continuing state surveillance will inevitably be required to ensure that thee] restrictions [against indoctrination] are obeyed"); Meek, supra, at 370 (invalidating Pennsylvania program on entanglement grounds because excessive monitoring would be required for the State to be certain that public school officials do not inculcate religion). In the majority's view, New York City's Title I program suffered from the "same critical elements of entanglement" present in Lemon and Meek: the aid was provided "in a per vasively sectarian environment… in the form of teachers," requiring "ongoing inspection… to ensure the absence of a religious message." 473 U. S., at 412. Such "pervasive monitoring by public authorities in the sectarian schools infringes precisely those Establishment Clause values at the root of the prohibition of excessive entanglement." Id., at 413. The Court noted two further forms of entanglement inherent in New York City's Title I program: the "administrative cooperation" required to implement Title I services and the "dangers of political divisiveness" that might grow out of the day-to-day decisions public officials would have to make in order to provide Title I services. Id., at 413-414.
Distilled to essentials, the Court's conclusion that the Shared Time program in Ball had the impermissible effect of advancing religion rested on three assumptions: (i) any public employee who works on the premises of a religious school is presumed to inculcate religion in her work; (ii) the presence of public employees on private school premises creates a symbolic union between church and state; and (iii) any and all public aid that directly aids the educational function of religious schools impermissibly finances religious indoctrination, even if the aid reaches such schools as a consequence of private decisionmaking. Additionally, in Aguilar there was a fourth assumption: that New York City's Title I program necessitated an excessive government entanglement with religion because public employees who teach on the premises of religious schools must be closely monitored to ensure that they do not inculcate religion.
B
Our more recent cases have undermined the assumptions upon which Ball and Aguilar relied. To be sure, the general principles we use to evaluate whether government aid violates the Establishment Clause have not changed since Aguilar was decided. For example, we continue to ask whether the government acted with the purpose of advanc ing or inhibiting religion, and the nature of that inquiry has remained largely unchanged. See Witters, 474 U. S., at 485 486; Bowen v. Kendrick, 487 U. S. 589, 602-604 (1988) (concluding that Adolescent Family Life Act had a secular purpose); Board of Ed. of Westside Community Schools (Dist. 66) v. Mergens, 496 U. S. 226, 248-249 (1990) (concluding that Equal Access Act has a secular purpose); cf. Edwards v. Aguillard, 482 U. S. 578 (1987) (striking down Louisiana law that required creationism to be discussed with evolution in public schools because the law lacked a legitimate secula