What would you consider to be proof that any god ever existed if such proof were to exist?<quoted text>
There is no proof that any god ever existed.
What constitutes as proof that anything at all ever existed?
You sound pretty confident that there is no proof, so I must assume that you have taken the opportunity to seek for such proof, but you haven't found it yet.
What have you done to seek proof that any good ever existed?
What kind of proof have you been looking for?
How did you determine what kind of proofs an existing God would demonstrate if in fact there is no existing proof from a god to compare to?