Treaty of Tripoli:

https://en.m.wikipedia.org/wiki/Treaty_of_Tripoli

"signed in 1796.[2] It was the first treaty between the United States and Tripoli (now Libya) to secure commercial shipping rights and protect American ships in the Mediterranean Sea from local Barbary pirates."

"Now be it known, That I John Adams, President of the United States of America, having seen and considered the said Treaty do, by and with the advice and consent of the Senate, accept, ratify, and confirm the same, and every clause and article thereof."

Article 11:

"Art. 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 Mussulmen (Muslims); and as the said States never entered into any war or act of hostility against any Mahometan (Mohammedan) 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."