Separation of church and state is not a myth. Not being codified into the language of the Constitution rather than being used as descriptive language in the talks beforehand doesn't make it a myth. It makes it part of the outline or a rough draft that was unnecessary in the final cut.

Calling it a myth is asinine, by the definition of the word. Separation of church and state is not a story or a fiction to explain how we got the 1st amendment. It's in preserved letters of discourse and the journals of the founding fathers. Nor is it a widely misunderstood belief. The founders absolutely desired matters of state be separate from matters of faith. Matters of faith are personal and the state should not intrude. Matters of state should never be hijacked by the zealotry of a particular belief system.

I hope you realize you're just repeating rhetoric you've heard from those who want to tear down that wall. Theocracies are typically not healthy societies.