Of course you can find examples of conflicts not motivated by religion. But do you think that for example Balkans would be such a shit show if all the nations involved had the same religion? They have the same ethnicity and similar language. What’s the divisive factor there? The rest of the Soviet Union managed to transition peacefully. Why is that? And what about the crusades? Was the motivation really the land? Or simply religion? What about missionaries and all the harm they have caused? Did any polytheistic religion had missionaries? I don’t think so.

And before you start listing other wars and crimes not motivated by religion I’m obviously not saying that without monotheism the world would be perfect. I’m just saying it would be better.