“Our Constitution was made only for a moral and religious people. It is wholly inadequate to the government of any other.”

― John Adams

John Adams (October 30, 1835 – July 4, 1826) was an American statesman, attorney, diplomat, writer, and Founding Father who served as the second president of the United States from 1797 to 1801. Before his presidency, he was a leader of the American Revolution that achieved independence from Great Britain. Wikipedia

On Article 11 of the Treaty of Tripoli

In a late 18th century treaty reached by America with certain Muslim pirates of the African coast, one part of which, Article 11, states:

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.

It was ratified by the United States Senate unanimously without debate on June 7, 1797, taking effect June 10, 1797, with the signature of President John Adams. The treaty was broken by Tripoli, leading to the First Barbary War. A superseding treaty, the Treaty of Peace and Amity, was signed on June 4, 1805. (Wikipedia)