Community is a good thing. Community is also a bad thing: it can lead to groupthink and the unquestioned following of authority figures. It also splits the world into "us" and "them", those of us who are part of the community, and those others out there who are not, or who choose not to be. This is why the question as to whether or not religion is a good thing is so difficult to answer.
On the one hand, religion provides community. Community can be a very good thing.
On the other hand, religion provides community. Community can be a very bad thing.
It's banal but true to say this is part of the human condition. But is there some way to mitigate the bad parts of community, while keeping the good?