As a theist, I don't believe in God because I perceive some positive benefit from that belief. My experiences and perceptions point to the existence of God. Of course those experiences and perceptions may be inaccurate and are subject to my own interpretations, so I can't claim that my beliefs are rational. I accept on an intellectual level that my belief could be wrong. This doesn't seem to enable me to stop believing.

However, I am involved in a religious community because there are positive benefits -- chiefly that of being able to compare notes with other people who share my irrational belief in God and my desire to do good work in the world. I can see that there might be positive benefits in religious communities for non-theists, though I don't really see the point.