@ThePokewithNoName would have insight on this, but I think you've basically named a cultist, a militant domestic political terrorist and a guy in Roof who is batshit crazy.
I can't see that you've listed a single relatable Christian archetype - and there are some reliably crazy ones - but no dogmatic murdererers or terrorists. None.
I think dogmatic terrorists that go on mass killing sprees in America constitute "reliably crazy ones." If you'r'e just going to distill and parse until you can isolate the muslim group of killers as being somehow distinctive from their christian counterparts, just say so.