I suppose an actual manifestation might do it, in the same way that meeting a kelpie would convince me that they existed as well. It would have to be something unambiguous, though, because otherwise, even if there was some demonstration of immense otherworldly power, how would one would which suggested deity (if any) was responsible?

No, I'm not waiting. Why would I be? I assume that you don't believe in Zeus, so are you waiting for him to turn up as well? Your beliefs don't bother me, and your particular choice of deity has no interest for me. I know some people think their beliefs should be important for other people who don't share them, but I'm afraid it's just not true.