Daniel Dennett and Linda LaScola have written a paper about five non-believing members of the Christian clergy. Teaser quote from one of the participants:

I think my way of being a Christian has many things in common with atheists as [Sam] Harris sees them. I am not willing to abandon the symbol ‘God’ in my understanding of the human and the universe. But my definition of God is very different from mainline Christian traditions yet it is within them. Just at the far left end of the bell shaped curve.