Here's a fairly decent encyclopeda article on the whole issue: Incorporation of the Bill of Rights by the 14th Amendment. If you click on the article's "First Amendment" link you'll get some info applicable to this issue.
" John Bingham, the principal framer of the Amendment. Bingham stated many times that the Fourteenth Amendment would enforce the Bill of Rights against state governments."
I have no problem with the Bill of Rights applying to the States.
How do they get around the "Congress shall make no law" clause?
But even if they apply it to state legislatures it would give religion more protection not less. It should allow more teaching of religion in schools not less.
I just don't see the logic.