I have always been opinionated - I'm analytical and I enjoy forming opinions. Since moving to Europe, I have learned not to let political opinions become so ingrained that they become part of my identity. I have seen so many things done differently and still done well.
My question is this: Which things are worth being part of my identity? Values I esteem? Relationships I hold dear? Family roles? I think it is fair to say that belief (or disbelief) in God is a foundational human issue. If you are a believer, I think that belief demands something - it necessarily becomes part of your identity. I am a believer, so I don't know if same is true for non-believers.