The morality of people who commit such atrocities has not evolved past the dark ages. It really has nothing to do with religion. Religion is just the excuse they use to justify their murderous tendencies. They are nothing more than sociopaths with no sense of empathy for the suffering of others. They wish for nothing more than death and destruction and pervert religious teachings in order to support their viewpoint and draw others to their cause. It is no different than a cult.