I think, as you know Rev, that the concept of god is whatever a believer believes is god. We recognise god in our own imagination. You say god is not a being, others say he is and yet others think she is not. All are correct within their own belief or faith. TT, probably quite correctly, points out that this is the ego talking, but what are we as humans if not for our ego, or at least our sense of self? We find it easier to worship something we understand, or go for the 'passeth understanding' option and, like an agnostic, agree it is all a mystery.

If you agree with the idea of god being a person's own construct according to their own faith or belief then there is no argument against the considered decision that god does not in fact exist. It would have to be allowed it is at least as likely as that he/she/it does.