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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.
In spite of my harsh critiques of my country (the U.S.) there are a lot of things about it which I have respect for and love dearly (and don't wish to see fade away.) One of these is the principle of 'separation of church and state.'
Some church-centric people believe that by merging their religion into the state apparatus they will gain advantage. Conversely, many political leaders believe that by leveraging the power of religion they can gain advantage to steer society in the direction of their choosing.
A very wise religions leader who I heard a while ago pointed out that the separation of church and state is more of a help the church defend
against the state than anything else. He seemed to see things with unusual clarity.
At this point I favor 'Christianity' over the other two Abrahamic schools because it seems the least political in it's core doctrine. That's what my research seems to indicate at least. I also suspect that a lot of the so-called 'Christian' churches are actually anything but. Looks to me as though they have been infiltrated at the highest levels to turn normal 'Christians' into foot-soldiers who will do the bidding of a whole different religion. Mostly political Zionism (and/or Lucifarianism to use the most appropriate technical term I know for it.)