dracomage1996: WHen all is said and done, it's just as good as real rock.
You're answering your own question, putting it on par with genuine rock rather than saying it IS genuine rock. If you know that, then you know why a rock purist doesn't like it.
The term "rock and roll" comes from Black American musical roots, the term itself being slang for sex. That original stuff is raunchier, grittier, and funkier than the White American rock that rose out it. Christian rock takes the white rock and bleaches it until it's see-through, leaving a pale trace of what the genre represents. Sure, it may sound like rock, but, and you'll forgive this, it lacks soul.
Can Christian influenced music be good? Hell yes. I love stuff that draws from that well ranging from the medieval vocal work of Anonymous 4 up to the folk hymns created by the Violent Femmes and Neko Case. But stuff that is deliberately pitched as Christian rock, along with Christian metal, is simply music for people who like that style but whose faith prevents them from listening to most of the bands that perform it. Like sugar-free candy and caffeine-free coffee, you are free to like it, but it's a diluted substitute for the real thing.
tinyE: Does "Gwar" count as Christian Rock or am I wrong about that?
Seeing as they are from my city, I'll venture an answer, which would be "no". They draw from a lot of mythology, and they certainly have a fascination with blood and suffering, but their affect is very Roman mixed with Pagan. Of course, a lot of modern Christianity is Pagan too, they just forget where they got it from.