Well, according to at least some analysts, Jefferson was a secularist wack-job, possibly a friend of Hillary:

Thomas Jefferson, primary author of the Declaration of Independence and the nation’s third president, twice experimented with editing the New Testament in order to “liberate” Jesus from the supernatural beliefs of the early Christians.

[ … ]

Jefferson’s confidence in his ability to extract a “real” Jesus from the Gospels is supreme evidence of hubris and arrogance. As historian Jaroslav Pelikan noted, Jefferson “was apparently quite sure that he could tell what was genuine and what was not in the transmitted text of the New Testament.”

And Ayn Rand is definitely not on board:

If it is ever proper for men to kneel, we should kneel when we read the Declaration of Independence.

And Billy Graham doesn't see the insidiousness of the separation. Leftie!

Sir David Frost: Is this still a Christian Country?

Billy Graham: No! We’re not a Christian Country. We’ve never been a Christian Country. We’re a secular Country, by our constitution. In which Christians live and which many Christians have a voice. But we’re not a Christian Country.