"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 country assured the world that the United States was a secular state, and that its negotiations would adhere to the rule of law, not the dictates of the Christian faith. 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. John Adams and the Senate made clear that the pact was between two sovereign states, not between two religious powers."
— Frank Lambert, Professor of History at Purdue University
"the Government of the United States of America is not, in any sense, founded on the Christian religion"
— exert from The Treaty of Tripoli, article 11- submitted to the Senate by President John Adams, receiving ratification unanimously from the U.S. Senate on June 7, 1797 and signed by Adams