I think it's fine in concept but in practice it is sometimes obnoxious. Mostly because it tends to dominate their lyrical content and becomes something that they have to announce - being a "christian band." That's pretty annoying because it doesn't actually describe what kind of band they are at all. Anyway, having all your songs being about religion is the same as if all your songs were about satan - you have to be really fucking good for it not to be dull.
"So yeah, monkey prostitution has happened."