Not to be harsh, but I've been in the exact same situation in my workplace re: the religious thing, and I've been forced to just suck it up. I'm the only non-Christian in the workplace, and it's just assumed that it's OK to put on the religious radio station after closing, because that's what everyone else can agree on. Of course, I suspect that many of them are for it simply because I'm opposed--I'm not terribly popular in my workplace, partly because I don't hide my religion. If someone asks, I'll tell, but I don't advertise.