Perhaps he could write better, more convincing Watchtower mags...Lol.
I think it really depends on the definition of "God." If we're talking about religious Gods, oh boy, so far nothing convinces me. In order to believe in those gods, he would have to talk to us or something. I mean, an all-powerful, all-knowing, presumably intelligent being higher than ourselves would most DEFINITALLY have to communicate with us by doing more than "giving us signs" and stuff. If he communicated with each and every human being, I would likely be convinced. Such collective subjectivity is pretty much what objectivity is. We rather consider it fact that the sky is blue because it is the general consensus. We only "know" it is blue subjectively. But because everyone agrees with us, the line between opinion and fact gets blurred. That way, it would be at least somewhat convincing. I mean, it wouldn't just be someone "hearing" god's voice or having him "intervene" or something, it would be everyone experiencing this. Actually, a god like that would be cool. Just as long as he's cool with me being an agnostic-atheist-humanist. But otherwise, people have to resort to this thing called "faith" in order to believe.
As far as other definitions of the word, such as, a being or type of beings higher than humans in the universe, I think this would be far more likely. Actually, I think we could actually INVENT a god. like, take a guy, build him a giant robot, make him super intelligent, make him biologically immortal...if we had technology like that, we could all be gods...but, then, we'd all be the same, so...no one is God anymore...
I consider myself an open-minded skeptic. This is a VERY interesting question, and, now that I think about it, it would be rather difficult to convince me of God. But I don't blame it on stubborness. I just think proving the EXISTENCE of ANYTHING, without a degree of subjectivity would prove to be a real doozy. Can you convince me the internet exists? I believe it does because of my own subjective experience. It interacts with me. Other people see it. I can assume it exists on the basis of supporting evidence which also exists. For example, I'm pretty sure I'm talking to real people right now. I'm pretty sure I've got a wi'fi connection. I'm pretty sure I'm interacting with something that exists, as we speak...Oh, geez, hope that didn't sound to indicative of insanity...