Jack, Hitler was raised a Catholic. Stalin and Pol Pot thought they were gods. You could look at those movements as a kind of "religion".

Atheists, for the most part, don't start wars. They have no axe to grind.

The religious mindset tends to see things in black and white, making them vulnerable
to ideologies that they think they need to defend with violence.

Atheists on the other hand tend to weigh their actions carefully, seldom agree on much,
are aware that they can be targeted and hence are more judicious.