I'm not sure what would suffice as proof; perhaps the whole universe would have to pass some kind of Turing test to prove that there IS a higher agency. As for evidence, some well-documented examples of supernormal phenomena would be a good start. If you believe in God-the-abstract-being, presumably you believe It has some effect on our physical world, no? That's why physical evidence is needed. It's pointless to argue about an abstract god that has NO effect (and never has) on our physical world, but nobody really seems to think that. If the God you're talking about has no physical properties, It still has to physically manifest itself (even if only in the creation of the universe) to be worthy of any debate.
I'm still not understanding the objection. "There's no evidence for God or gods, and there's no evidence for unicorns, therefore each is as likely as the other" is my argument. You're saying the comparison is false. Then what, if not evidence, makes God more likely than unicorns? Or, if something satisfies the criterion of evidence to you, what is it?
It strikes me as hubris to say that God is all powerful and all knowing, and then presume to know His desires. I'm not saying that's you -- it's more of a religious thing. I'm just saying.
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