I don't know if this was meant to portray religion as a bad thing, but I know some people would agree with that portrayal so I'd like to say something about that.

There would be fewer wars if everyone was the same race. There would be fewer wars if everyone was the same gender. There would be fewer wars if everyone was of the same social and economic class. There would be fewer wars if everyone came from the same territory/nation. There would be fewer wars if everyone was exactly the same. People war over religion because it's what differentiates them from another, and to religious people, is likely the most significant difference. The same goes with race and any difference that we can distinguish between groups of people. A great example of how easy it is to pin two groups of people against each other for no reason other than a physical difference is the blue eyes experiment performed by Jane Elliot, an Elementary school teacher. Just because people can't always accept differences between each other doesn't make those differences bad.