The first major world leader, to profess monotheism was Amonhotep an Egyptian Pharoah approximately 200 years before Moses.
Religious wars continue to be the most unforgiving conflicts.
Religions routinely demand absolute obedience, anyone who doesn't is a heretic, a blasphemer, a devil worshiper, etc. When equally fervent religions collide you're bound to have conflict. This divisive behavior does not come from God but from our own self righteousness. We search for reasons to condemn those we don't understand rather than listening to them first. The concept of Manifest Destiny was built on such self righteous arrogance.