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Several of the largest genocides were undertaken by the U.S.S.R and the Communist Chinese. Both were devoutly anti-religious (although there is some evidence to suggest that certain of the communist leadership in Russia, at least, were into certain esoteric forms of spirituality with a roots in Kabbalah.)
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~Nationalism is a different kind of religion~
https://www.google.com/search?q=nationalism+and+religion&pws=0Anyway, anything that based on belief and not rationality will bring more damage than benefit.