“Separation of Church and State” appears nowhere in the Constitution. It was invented in 1949 by a SCOTUS Judge who was a Catholic hating member of the KKK.
IMHO, Jefferson debates himself....and a lot of his writings are just ramblings....
No...
It was landmark U.S. Supreme Court precedent Reynolds v. United States in 1878 that made “separation of church and state” a dubiously legitimate point of case law, but more importantly; it confirmed the Constitutionality in statutory regulation of marriage practices.