Hi nicolaou,
If I hear voices, or if someone comes up to me to tell me to do something to harm another because God said so, I would immediately dismiss that instruction because my God is Love and DOES NOT use His people to fight His battles. He has legions upon legions of mighty angels to do that for Him. So any fanatic that harms another under the banner of religion is NOT a follower of the true God - in fact his god is weak because he sends him to do his dirty work.