First Amendment to the United States Constitution …

Thomas Jefferson wrote with respect to the First Amendment and its restriction on the legislative branch of the federal government in an 1802 letter to the Danbury Baptists (a religious minority concerned about the dominant position of the Congregationalist church in Connecticut):

Believing with you that religion is a matter which lies solely between Man & his God, that he owes account to none other for his faith or his worship, that the legitimate powers of government reach actions only, & not opinions, I contemplate with sovereign reverence that act of the whole American people which declared that their legislature should "make no law respecting an establishment of religion, or prohibiting the free exercise thereof," thus building a wall of separation between Church & State. Adhering to this expression of the supreme will of the nation in behalf of the rights of conscience, I shall see with sincere satisfaction the progress of those sentiments which tend to restore to man all his natural rights, convinced he has no natural right in opposition to his social duties.[9]

In Reynolds v. United States (1878) the Supreme Court used these words to declare that "it may be accepted almost as an authoritative declaration of the scope and effect of the amendment thus secured. Congress was deprived of all legislative power over mere [religious] opinion, but was left free to reach [only those religious] actions which were in violation of social duties or subversive of good order." Quoting from Jefferson's Virginia Statute for Religious Freedom the court stated further in Reynolds:

In the preamble of this act [...] religious freedom is defined; and after a recital 'that to suffer the civil magistrate to intrude his powers into the field of opinion, and to restrain the profession or propagation of principles on supposition of their ill tendency, is a dangerous fallacy which at once destroys all religious liberty,' it is declared 'that it is time enough for the rightful purposes of civil government for its officers to interfere [only] when [religious] principles break out into overt acts against peace and good order.' In these two sentences is found the true distinction between what properly belongs to the church and what to the State.

Originally, the First Amendment applied only to the federal government, and some states continued official state religions after ratification. Massachusetts, for example, was officially Congregationalist until the 1830s.[10] In Everson v. Board of Education (1947), the U.S. Supreme Court incorporated the Establishment Clause (i.e., made it apply against the states). In the majority decision, Justice Hugo Black wrote:

The "establishment of religion" clause of the First Amendment means at least this: Neither a state nor the Federal Government can set up a church. Neither can pass laws which aid one religion, aid all religions, or prefer one religion to another ... in the words of Jefferson, the [First Amendment] clause against establishment of religion by law was intended to erect 'a wall of separation between church and State' ... That wall must be kept high and impregnable. We could not approve the slightest breach.[11]

In Torcaso v. Watkins (1961), the Supreme Court ruled that the Constitution prohibits states and the federal government from requiring any kind of religious test for public office. In the Board of Education of Kiryas Joel Village School District v. Grumet (1994),[12] Justice David Souter, writing for the majority, concluded that "government should not prefer one religion to another, or religion to irreligion."[13] In a series of cases in the first decade of the 2000sVan Orden v. Perry (2005), McCreary County v. ACLU (2005), and Salazar v. Buono (2010)the Court considered the issue of religious monuments on federal lands without reaching a majority reasoning on the subject.[14]

Everson used the metaphor of a wall of separation between church and state, derived from the correspondence of President Thomas Jefferson. It had been long established in the decisions of the Supreme Court, beginning with Reynolds v. United States in 1879, when the Court reviewed the history of the early Republic in deciding the extent of the liberties of Mormons. Chief Justice Morrison Waite, who consulted the historian George Bancroft, also discussed at some length the Memorial and Remonstrance against Religious Assessments by James Madison, who drafted the First Amendment; Madison used the metaphor of a "great barrier."[15]

Justice Hugo Black adopted Jefferson's words in the voice of the Court.[16] The Court has affirmed it often, with majority, but not unanimous, support. Warren Nord, in Does God Make a Difference?, characterized the general tendency of the dissents as a weaker reading of the First Amendment; the dissents tend to be "less concerned about the dangers of establishment and less concerned to protect free exercise rights, particularly of religious minorities."[17]

Beginning with Everson, which permitted New Jersey school boards to pay for transportation to parochial schools, the Court has used various tests to determine when the wall of separation has been breached. Everson laid down the test that establishment existed when aid was given to religion, but that the transportation was justifiable because the benefit to the children was more important. In the school prayer cases of the early 1960s, (Engel v. Vitale and Abington School District v. Schempp), aid seemed irrelevant; the Court ruled on the basis that a legitimate action both served a secular purpose and did not primarily assist religion. In Walz v. Tax Commission (1970), the Court ruled that a legitimate action could not entangle government with religion; in Lemon v. Kurtzman (1971), these points were combined into the Lemon test, declaring that an action was an establishment if:[18]

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First Amendment to the United States Constitution ...