On a serious note, this is a pretty salient point about religion. In general the principles espoused by most of the major religions are fine- be nice to other people, don't defraud others, don't get too full of yourself, you are responsible for your actions, etc. The problem is that
organized religion tends to be quite problematic as it becomes a government of sorts, either de facto or literally. You get a lot of "us versus them" and a varying lack of tolerance/antagonism to people with other belief systems. That's where you get the cultural warfare (in non-theocracies like the U.S.) or actual fighting and warfare (in theocracies like in the Middle East and Africa.)
I think Mohandas Gandhi summed this up quite well:
I like your Christ. I do not like your Christians. They are so unlike your Christ."