Courtesy of Ed Thibodeau [via Jerome Doolittle]

The Barbary Treaties of 1786-1816, as negotiated by George Washington in a treaty with the nation of Tripoli on November 4, 1796 and ratified by the United States Senate on June 10, 1797, specifically say:

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.

Looks like proof to me. We keep hearing arguments these days from the leaders of the religious right, trying to convince us that our nation was founded on Christianity. They are wrong. Or else they are liars. Neither is hard for me to believe.