story
I went to church as a kid and know what you mean. However, the shared belief usually implies a narrower heterogeneity, if that makes sense (in a way that’s proportional to how orthodox the beliefs are).
In a secular shared space it’s far more common to be exposed to people with radically different beliefs, sexual orientation (or even preferences), and political views, to mention a few examples.
I think it’s very important that people have places where they can be surrounded by others that, while different as you say, all share a very important core belief, but it’s also very important for a healthy society to have spaces where radically different people can coexist peacefully and even work towards some goal together (e.g., a “repair” meetup where people go get something fixed or help others fix things).