This is the problem I had a a JW. After the big A failed to materialize in 1975, I started to feel like the field ministry was futile. I still believed on some level in the religion, but knocking on doors did not give any feeling of having done any thing worthwhile. By the time I left, I hated it and felt it was a waste of time. I began to realize I would rather have spent the time feeding the hungry or some other, more concrete, charitable works.
I actually contemplated joining a church recently. Part of the reason is that this church was very active in feeding the hungry and other things. I am not sure about God, but as Ygnat said, good is good. It's not that I don't know that the church has done some terrible things, it's that I think that they can change and provide the good things (fellowship, support, good works) without the bad (dogma, ridiculous rules, hatred for non believers).