mao, stalin, hitler, pol pot et al. may have killed their victims for political reasons, and
their victims may have been selected for their religious beliefs (jewish, confucian, buddhist
et al.).  whilst not a jew myself, as I understand it the jews killed by hitler and stalin were
not semitic but were slavs, germanic, french, polish in ethnicity - IOW ethnic europeans
rather than emigrants from palestine.

p.s. in china confucianism is now being revived, but they still suppress tibetan and muslim
religious minorities.