So many backwards concepts are promoted by the politics of the overly faith-promoting.
One of them is the separation of church and state not being a part of the constitution.
And then, we see a legislative attempt to pass a bill that bans Sharia law, as if that's 1) a valid concern, and 2) not hypocritical.
Anyways. Opponents of the separation will sometimes say things like "separation of church and state can't be found at all in the constitution."
Here's one way to respond to this remark, as quoted in this article:
When Bradley and Mercer asked to identify where the words “separation of church and state” could be found in the Constitution, Frank Knaack of the American Civil Liberties Union shot back, “it probably is alongside right to privacy, separation of powers, [and] other understood concepts from the Constitution that do not exist in those words in the Constitution.”