"Do we go because we can clearly see that we’re growing and changing, living with more grace and forgiveness and becoming “better people?â€ Is there any evidence of that? Or maybe we don’t really see the growth and change in any tangible way, but we sense that it might be there, gradually building in us, so we go to church based on that hope."
--Well, I don't go to Church anymore, but it was always my impression that the community of believers sees going to Church as part of the stimulus for making them better people, for helping them to grow and change.

I'm really glad you ask questions like these.  Not enough Christians know why they do what they do.  Not enough agnostics know why they do what they do.  I once had a professor who told me that "thinking is attacking your own thoughts."  That's always stayed with me, this idea that you're truly thinking when you question your own motives and re-assess your beliefs.