First of all, the Founders were mostly deists, not necessarily Christians. In fact, Jefferson was most likely atheist (or at least agnostic).

The point I was making is, once religion becomes a party platform, then it basically *is* similar to trying to hold one religion above all others as "official", which is against the Constitution. I'm not saying the candidates themselves can't profess their religion, just that a party platform shouldn't be doing it.