There isn't a universally accepted definition of a deity that we can honestly discuss. We can only make conjectures about who, what that entity might be. But, given the absence of said deity, any discussion we may start about it may start with wrong premises. It's incredibly pretensious to say : "define me any deity and I shall prove its inexistence". What a preposterous claim - it sounds very much like a profession of faith. No, Cofty. Both Theists and Atheists make spectacular claims about deity or deities and none of them can provide the necessary overwhelming evidence to back up their claims. It's the only thing that can be honestly said about God - that it's absent.
As for God not corresponding to the ideas we have about God ... I don't see in it enough logical grounds to be an atheist. Perhaps, one could say "I don't care if the God I expected to exist does indeed exist or not. It's indifferent to me." That's another story - that's "apatheism" - apathy towards God.
Eden