Of course, the "founders" were people that were kicked out of everywhere else because they were trying to convert them to their extremist religious views
Small Correction: Those were the Puritans / Pilgrims, and they predate the Founding Fathers by over 150 years. They showed up in 1620, pretty much as-described in the post, but the people who we consider the Founding Fathers didn't actually found the country until 157 years later. The latter did not want a religious theocracy here unlike the earlier settlers who were so insufferable England basically put them on a boat and set them adrift in the Atlantic (not literally, but not exactly not that, either).
Many Americans also fail to realize there's a 157 year gap between "fled England to escape religious persecution" and declaring independence from England. They also fail to realize the puritans were the persecutors and not the ones being persecuted (Edit: I originally phrased that backwards).
So apparently,, in the US, anything goes. The holy Flying Spaghetti Monster, blessed be it's meat balls, showed us that. But then what?
Technically / legally? Yes. However, there's increasing Christo-publican insistence on treating anything but Christianity as a second-class religion, at best, while implementing clearly unconstitutional laws based on their flavor of Xtianity.
Also, is this a question for the US demographic, or are you just blowing off steam? Not that I disagree with you, just trying to keep the community on-topic.