The Founders knew that including a god mean't passing laws to protect him. Jefferson wrote in the Treaty of Tripoli this:
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; and, as the said States never entered into any war, or act of hostility against any Mahometan 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.
This treaty was authored by American diplomat Joel Barlow in 1796 it was later sent to the Senate floor on June 7, 1797.................it was approved by John Adams after being read allowed that is.
It was created (the US) as a secular nation.
Edited by Evangelical Humanists, : No reason given.