There is no point in making sweeping generalizations about any sizable human group - humans never behave monolithically. This certainly applies to Christianity

There is no point in making sweeping generalizations about any sizable human group - humans never behave monolithically. This certainly applies to Christianity and Islam with all their history of sects that have spent half their energy fighting the other sects within the "same" religion. It makes even less sense in the case of "atheism" which encompasses many unrelated belief systems. Many have argued that many of the belief system movements ostensibly related to Marxism went on to commit great evil precisely because they became defacto religions complete with bibles (e.g. red books), prophesy and personality cult "Gods". Somehow no matter whatever humanistic goals belief movements start with, very quickly individuals within the movement are able to increase their own power by emphasizing the need to demonize outsiders/ non-believers and to squelch disagreement.