Nah, I'm not a Christian.
Not being facetious - Christian Terrorism is definitely an issue that is causing problems world over. The techniques are more subtle than its Islamic counterpart, however, it is still terrorism nonetheless. And, half the problem is denial that the problem exists.
Christian Terrorism was the main strategy to exterminate Native Americans (until the 1980s).
Sample 1:
Link
Sample 2:
Link
Also, ISIS is a really low bar - my point is not that Christian Terrorism is as bad as ISIS or Al-Qaeda - it's still terrorism because the terrorist who did this dastardly attack was motivated by ideological narratives that demonized another group and inculcated a severe persecution complex. This moron acted on the Christian Terrorist doctrine; most don't, just as in Islamic Terrorism (a lot more do but that doesn't negate the point).
Da troof hurfs?