HP I didn't come to the same conclusion as you about God, but I so appreciate your post, you are a good potato!! :) and I feel your frustration, having to go through the motions and having a believing wife. It's not at all easy. I love your personality.
For me, I did not stop believing in God, so to reconcile evolution and some problems i had with biblical passages, I became a nonfundamentalist Christian. It's really freeing.
If you choose atheism, you just have to live your life the best you can and make peace with that. I could have been a happy atheist I think, but in the process of leaving the religion I found Christ.