I think that like anyone else the band references God, or their spiritual influences in the context that they know, for them it's going to be from a Catholic based point of view since that is what they grew up with.
I get what you are trying to say, that a non christian person might not enjoy the references, but in the case of BJ those references are small, usually fairly general and I can't see why it would be a make or break when it comes to liking or not liking their music. I