You can have your own notions. The atheists did not kill any one for rewards in a life here-after. And of course the US had killed more people than all of them put together. The Christian priests in US had even blessed the fight pilots who bombed Hiroshima and Nagasaki knowing fully well on what mission they were.
Pl search for War Crime Tribunal to know more about the atrocities committed by participants in WW-II, mainly by the Japanese, predominently beleiving in Buddhist non-violence. The less we talk about other religions, the better.
