Well, bands like For Today and Sleeping Giant can do whatever the fuck they want to pertaining their religion and their music, because I don't listen to them. I don't care about what bands I don't listen to do, because it's their thing; if they get a kick out of it, let them do whatever they feel like. Metal (or any other genre of music for that matter) shouldn't have limits set, even when most of the musicians in metal oppose it; after all, music is an art form, and artistic freedom is all about not being bullied into anything, and doing what floats your boat.
Outside of music, however... fuck Christianity.