What would the world be like without religion?

I think the world would have no war, or conflict because every religion has a reason to dislike each other from religious differences. When Jesus was killed by the Jews it created a hatred for the Jews and the Christians. When the Jewish people took back the holy land (Jerusalem) the Muslim people got angry at the Jewish people. The Romans had different religion than the christians and Jews so they killed many. The crusades were caused by Christian and muslim tension as well. All of these have caused a historical hatred in every religion, so if the world never came up with religion then no one would ever have a big reason to have go to war with eachother. Although there would be small reasons to have war, no one would ever create a reason like the Germans in the holocaust.