Do they? Or is that they know that giving lip service to certain types of hot button issues will get them elected?
Many of the Founding Fathers were agnostic or even Atheist. The, new at the time, concept of separation of church and state was rooted in some pretty dark history. After literally 1,000 years of religious warfare, our Founders decided that enough was enough. We have no State religion..nor will we ever.
We were founded by at least some Christians....but it was not a Christian founding.
Christ said, "My kingdom is not of this world, but of the next".
Let's take his word for it eh?