Hmm...seeing him create a planet and then, explaining to me how he did it. Then, doing it again, while I watched. A small request. That would be fairly persuasive. But still, I woild suspect I was hallucinating or delusional (a foreign concept to you, no doubt). So he would then have to do it again for me and a panel of scientists, at least 10 or 20 more times.
But that still wouldn't mean I would worship him or even like him. If the nasty rag that is the bible is to be believed, he has a lot of explaining to do before i even think about not considering him to be a vile, nasty little god.