I was thinking of this because I had just read this blog post from David Lindsay the other day:
"And the American Founding Fathers were not Christians. They were Deists, and their position is exemplified by
The Jefferson Bible, from which he excised all reference to Christ’s Divinity, Resurrection or miracles; copies were presented to all incoming members of Congress until the 1950s.
"However, the phrase “the separation of Church and State” does not occur in the Constitution. Rather, the First Amendment’s reference to religion was designed to stop Congress, full of Deists as it was, from suppressing the Established Churches of several states, although they all disestablished them of their own volition later on precisely because they had fallen so completely under the Founding Fathers’ influence.
"The 1797 Treaty of Tripoli, “of Peace and Friendship between the United States of America and the Bey and Subjects of Tripoli of Barbary”, was submitted to the Senate by President John Adams, was ratified unanimously, and specified that “the Government of the United States of America is not, in any sense, founded on the Christian religion”. Although he attended Episcopalian services with his wife, George Washington did not receive Communion."
http://davidaslindsay.blogspot.com/2018/08/heres-deal.html