IMO Differences in religious beliefs are responsible for the vast majority of the conflict that exists in the world today and throughout history. Muslims hate non-Muslims because they're not Muslim. Even Christians have a long and checkered past of killing non-Christians i.e. the crusades. If all religious beliefs could be magically wiped away and the entire world could live by the same universal moral code most of the conflict in the world would disappear. You don't have to believe in an imaginary supreme being to be a descent moral person.