What is Justin Biebers religion?

I was just curious & wanted to know. Some people say he's Christian, some say Catholic. I need an answer with some back up to support your answer. Don't just say 'oh he's Christian he said that in an interview' - well, send me a link of that 'interview'. & maybe if we get enough people to answer, we can all bug him & tweet him asking what his religion is ;). Im doing it just out of curiousity. No fighting. Thank youuu <3 im a beleiber forever.