Personally I don't believe in an old guy in the sky with a white beard, nor do I believe that the Adam and Eve story is literally true or that Darwin was necessarily wrong.
My concept of God is that it is something like truth, beauty, love etc., or whatever maintains them. No-one can see these qualities, but most people behave as if they exist in some way. So either there is something essential to them or maintaining them, or there is not. If there is not, then our lives are futile and we might as well give up. If we don't give up, we are implicitly acknowledging that there is something beyond the world of everyday appearance which makes participation in that world worthwhile.
Another way of looking at the God-concept is that it represents a state of harmony or wholeness which is conceived as lying beyond nature as it exists, and which makes sense of striving to live a life in accord with such a state of underlying harmony (ecological responsibility etc).
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