How do religions unify and divide people?

I believe that religions unify people in a few ways. One of those are that it interests people on how they think. For example what they believe in. Like how Buddhists believe in the Buddha and Hindi's believe in Ganesha. I find it interesting as well. I have always liked to learn about religions especially because I have been learning about them for a long time. I also think that they unite because sometimes people feel the same way for a certain thing. Like a hunger strike some people may agree and some may not. I think that they divide people in many ways but here is the main one; I think that they divide people because of their beliefs and thoughts. The reason I think this is because that everyone has their own way and some people get into fights because of it. And that is what I think about the question, how do religions unify and divide people.