attrocities. But I am not sure if they indeed used religion as the excuse for real industrial-grade evil - killing off entire cities or nations, like Crusaders did to Constantinople, Nazies to Jews and Stalin to Chechens. Aztec gods and Moloch required human sacrifices, which is a horrible deed, but, when their followers set out to subjugate neighbors, did they do it because Moloch told them he needs more victims? I do not know enough about Aztecs, but Carthage's commercial expansion brought it in conflict with Rome, not religion.
Mars is another good example. Are Romans favored by Mars because the conquer, or are they conquering to please Mars? I thing former is closer to Romans' feelings.