Well, if you were to start naming religions that kill Christians, which one would be both first AND last on your list...
Either he was one or was channeling one.
The Columbine shooters also targeted Christians. I suppose they were muzzies too? Claiming “facts” not in evidence only discredits you when you are right.
At least channeling Satan.
Or more accurately, Satan was pulling his puppet strings.
Plays on the same team as the Muslims, but not necessarily one.
I still think he was a terribly tortured young man (i.e., insane), and perhaps his mother had tried to get him to go to Church. This built up a resentment of all things Christian - and Satan pushed him along his craziness.
At least that is my theory based on absolutely nothing.