where does the phrase separation of church and state originated
Separation of church and state In English, the exact term is an offshoot of the phrase, "wall of separation between church and state", as written in Thomas Jefferson's letter to the Danbury Baptist Association in 1802. In that letter, referencing the First Amendment to the United States Constitution, Jefferson writes:
Separation of church and state in the United States Article Six of the United States Constitution also specifies that "no religious Test shall ever be required as a Qualification to any Office or public Trust under the United States."