Treaty of Tripoli - passed by the U.S. Senate in 1797

This treaty was develop to reassure the Muslims in Tripoli that the United States was not a Christian nation and was not going to start a religious war against the Muslims:

From http://www.museumstuff.com/articles/ar187051062241851.html

PAGE SUMMARY: Also knows as .. "Treaty of Peace and Friendship between the United States of America and the Bey and Subjects of Tripoli of Barbary" .. The Treaty of Tripoli, passed by the U.S. Senate in 1797, read in part: "The government of the United States is not in any sense founded on the Christian religion." The treaty was written during the Washington administration, and sent to the Senate during the Adams administration. It was read aloud to the Senate, and each Senator received a printed copy. This was the 339th time that a recorded vote was required by the Senate, but only the third time a vote was unanimous (the next time was to honor George Washington). There is no record of any debate or dissension on the treaty. It was reprinted in full in three newspapers - two in Philadelphia, one in New York City. There is no record of public outcry or complaint in subsequent editions of the papers.

Treaty of Tripoli - passed by the U.S. Senate in 1797
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ARTICLE 11 - As the government of the United States of America is not in any sense founded on the Christian Religion,-as it has in itself no character of enmity against the laws, religion or tranquility of Musselmen,-and as the said States never have entered into any war or act of hostility against any Mehomitan nation, it is declared by the parties that no pretext arising from religious opinions shall ever produce an interruption of the harmony existing between the two countries.