Religion, in itself, may or may not condone these barbaric atrocities - though in practise many of them do - however, religion does make justifying them far too easy. It's a perfect umbrella for the criminally and psychopathically despotic (try saying that six times fast).
At the age of five, Skagra decided emphatically that God did not exist. This revelation tends to make most people in the universe who have it react in one of two ways - with relief or with despair. Only Skagra responded to it by thinking, 'Wait a second. That means there's a situation vacant.'