Religion played only a supporting role in the American Revolution. As the new republic's founding documents attest, secular matters were paramount. The Declaration of Independence sets forth a rationale for revolution that closely follows John Locke's liberal conception of the relationship between the governed and the government, and it includes a long list of grievances against George III for his alleged violation of the colonists' constitutional rights. The offenses listed relate to such issues as taxation, representation, standing armies, and markets; they do not include religious issues.

Similarly, the U.S. Constitution is a secular document with scant mention of religion. Records of the Federal Convention that deliberated in Philadelphia for four months in 1787 include only a smattering of religious language. The name of Jesus or Christ does not appear at all, and the framers invoked the name of God just twelve times. Even then several of the phrases were such popular expressions as “Good God, Sir …” and “God knows how many more …” rather than reverent invocations of the deity's name. The Constitution itself contains only one reference to religion and that a negative one: “no religious Test shall ever be required as a Qualification to any Office or public Trust under the United States.” The Constitution granted no power whatever to Congress pertaining to religion. Although applied only to the federal government, the removal of religion from government jurisdiction soon led the states to adopt similar measures.