Signed and ratified by the founding fathers in 1797, Article 11 of the Treaty of Tripoli clearly states that "The Government of the United States of America is not, in any sense, founded on the Christian religion..."
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.
"Winthrop had brought with him the charter, and this was the first step in a very important process--the process of fusing the company and the colonists into one body. The second step, which soon followed, was the admitting of the colonists, or "freemen", to membership in the company. By this the company ceased to be a private trading company conducted for commercial gain; it became a body politic, a self-governing community. The condition of freemanship was made, not property or educational test, but a religious qualification. The company was conservative and the process was slow. When there were 3000 settlers there were but 350 freemen, but the beginning of popular government was at hand. The ostensible object of the company, when it secured the charter, was to profit by trade; the real object was to establish a religious community with freedom of conscience, not for all, but for those only who were in religious accord with them. And the religious test for freemanship became the safeguard by which they secured for the future the end for which they had sacrificed so much. "
"Not sure what your point is. You do understand that the government is not the same thing as the country, right? That we all wanted a secular government because of the religious persecution that Puritans and others faced in Europe. So each sect could worship as it sees fit. That doesn't mean we weren't a Christian country."Via