I wouldn't limit myself like that; music that isn't specifically "Christian" isn't necessarily going to impart values opposed to those taught by your religion, and you're missing out on a lot of good stuff.
That said, you'll find that most bands thank some kind of God in their liner notes. XD Does that make them Christian?
An opinion on this, please. The Israeli band Man Alive has three members: two Jewish brothers, and a Christian member. I'm not sure how orthodox the Jewish members are, but I know the Christian member follows his religion closely. Would you listen to them?