our founding fathers were christians

Yes, they were. They're probably looking down from Heaven wishing they wrote the Constitution differently, because now prayer in schools is considered "unconstitutional".

Esp the First Amendment! I think if it was worded just a little bit differently, it wouldn't have been misinterpreted. It's a federal congress that couldn't pass a law establishing a national religion. The states could & did have something like a state church. [The Puritans in Massachusetts 4 example]

This is demonstrably false.