[Serious] Could an omnipotent and omniscient god prove that he was God?

[Objectivist]

In his seminal book, The God Delusion, Professor Richard Dawkins states the following:

"If he existed and chose to reveal it, God himself could clinch the argument noisily and unequivocally in his favor."

If there was a god, could he prove that he was God?

Sure, It's not that hard to prove something.  Proof is a process of reducing an idea to the perceptual level of consciousness. It would just have to show up and heal a few amputees, make it rain skittles, and hang a giant disco ball in the sky over every city that shouts out I am the lord your god.  I'm sure an omnipotent and omniscient being could think of some even better things to do to prove its existence, but it hasn't even thought its adherents claim that it wants us all to believe in it and loves us and wants to have a relationship with us.