Quote from : The Founding Fathers and the Place of Religion in America Book

By their actions, the Founding Fathers made clear that their primary concern was religious freedom, not the advancement of a state religion. Individuals, not the government, would define religious faith and practice in the United States. Thus the Founders ensured that in no official sense would America be a Christian Republic. Ten years after the Constitutional Convention ended its work, . The assurances were contained in the Treaty of Tripoli of 1797 and were intended to allay the fears of the Muslim state by insisting that religion would not govern how the treaty was interpreted and enforced. and the Senate made clear that the pact was between two sovereign states, not between two religious powers.