The Religion Clauses of the First Amendment provide: 'Congress shall make no law respecting an establishment of religion, or prohibiting the free exercise thereof.' These two Clauses, the Establishment Clause and the Free Exercise Clause, are frequently in tension. See Norwood v. Harrison, 413 U. S. 455, 469 (1973) (citing Tilton v. Richardson, 403 U. S. 672, 677 (1971)). But the Supreme Court has long said that, 'there is room for play in the joints' between them. Walz v. Tax Comm'n of City of New York, 397 U. S. 664, 669 (1970). In other words, there are some state actions permitted by the Establishment Clause but not required by the Free Exercise Clause. Under the Establishment Clause precedent, the link between government funds and religious training is broken by the independent and private choice of recipients. See Zelman v. Simmons-Harris, 536 U. S. 639, 652 (2002); Zobrest v. Catalina Foothills School Dist., 509 U. S. 1, 13-14 (1993); Witters v. Washington Dept. of Servs. for Blind, 474 U. S. 481, 487 (1986); Mueller v. Allen, 463 U. S. 388, 399-400 (1983).
The First Amendment reflects the philosophy that Church and State should be separated. ...