If God showed up tomorrow and stopped a Tsunami from killing hundreds maybe thousands, 40% of the people (most in China) will insist He is an alien.
If He showed up and announced His Being every agent in Hollywood would look to sign Him, every lawyer would file suit against Him for some reason or another. Every church would suddenly be filled to capacity. Wars would start whether or not He called himself Jehovah or Allah.
You want me to prove that God exists, I say go ahead and create something that doesn't.
MP-The problem there is that we do experience a shared reality as is obvious by this dialog so do we take into consideration how we respond to that reality or how that reality responds to us? Likewise if there is an observable reality that should only be of an individual concern what would the sense be to relate to it at all?
Like Socrates said about piety and the Gods. Is good only good as good does or is good as good is? (my words)