From the 1796 Treaty between the United States of America and The Bey and Subjects Of Tripoli Of Barbary:
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 tranquillity, of Mussulmen [Muslims]; and, as the said States never entered into any war, or act of hostility against any Mahometan [Muslim] 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.
Well there it is in black and white. I predict the looney right will continue to ignore it.