Well, of course you're free to believe that it is ok to kill innocent people just because they are not Christian. But I'm sorry to say that your belief has absolutely nothing to do with Christianity.

Christianity is a religion of love, not of intolerance and hate. I think only few today have such a hate towards other religions that they want to punish a different belief with killing or torture in hell. Christians don't justify killing innocents or torturing them in hell. The 9/11 terrorists might have agreed with you but Christians won't.