It really depends on what you like to listen to.
Most of Bach, parts of Mozart (like Till posted) are Christian music, and are a huge masterpiece for anyone into classical music, the Russian liturgy music is absolutely fantastic if you are into choral music, there is Christian rock, there is Christian music for children (carols, anyone?) and pretty much anything you can think of.
If you want metal, it's going to be hard, since it contradicts some of the surface aspects of Christianity. It's going to be hard to find good music of a group that disagrees with some parts of how that music is made or performed, so if you only like metal, it's no wonder that you can't get the satisfaction you want from Christian music. If this is the case, the mistake is both in the other people's opinions (believing that you would have to like Christian music) and your opinion (believing that Christian good music cannot exist - but since you only think metal is good music and most Christians would rarely encourage metal your request is unfillable).
