I freely admit this, I don't like Christianity and am put off by anything to do with it. By the same token, I can kinda get on with Anti-Christian lyrics because they're some of the things I've thought at times...
Now... christian lyrics in Ska, not a preference, but it kinda makes sense.
Christian lyrics in metal... It feels completely wrong. Its agressive music. Dark music. Neither are thing that should be associated with christianity IMO.
I don't care if bands are christian, I do mind if they start putting it into Metal. Bigoted of me perhaps, but there you go.