Oddly enough I cannot think of any "Christian" terrorist group in the world who have a stated aim of creating their own empire were everyone living in it must convert to one particular brand of Christianity and agree to live under "Old Testament" religious courts as the only form of law.

Can't think of any other "religious" terrorist groups either apart from the various Islamic ones, who have been plaguing the world for the last 45 years.

Other terrorist organisations do exist of course but their aims and motives tend to be political and/or secular.