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The awful atrocities of religion happened when people assume that God shares your likes and dislikes. The Crusaders when into battle to kill Muslims and Jews and cried, "God will's it." That was their battle cry. Obviously God willed no such thing. The Crusaders were simply projecting onto a deity they'd created on their own image and likeness, all their hatred and loathing of these faiths and made it endorse some of their most awful prejudices and lethal prejudices.