Can you imagine a world without land? Resources? Opinions? It won't make a difference other than what they base their decision on. Hitler after all sought power and ethnic cleansing and wasn't really a practicing Christian. Hate was his downfall and it was rooted in racism and a lust for power. Was Chairman Mao a religious zealot? Stalin? Evil is a part of human nature regardless of whatever label is placed upon the reason for acting.
How about we imagine a world of free people and not totalitarian, socialist governments that took around 200+ million people off the face of the Earth in the 20th century. Religion had little if anything to do with those atrocities.