I will prove to you that God exists

[Sheldon]

That wasn’t the question, though, was it? I think Sheldon was asking what, if anything, is your standard for disbelieve generally. If you don’t have such a standard, that’s fine, but it makes any argument regarding your beliefs inherently weak.

Boru

What's yours?

About the highest level of certainty we can have is a scientifically established claims that pass the rigors of critique and repeatable experiments that confirm the hypothesis. Unfortunately not all theories can be so tested. 

The second level is evidence beyond a reasonable doubt. It doesn't mean all doubt is erased but reasonable doubt is.

The third level is a simple preponderance of evidence. In the mind of the beholder there is more evidence in favor of one claim than against it. Or there is more evidence that disfavors the claim than for it.

Evidence are facts that make a claim more or less probable.

That depends on the evidence, and lest we forget you have only present subjective claims, and arguments that are demonstrably irrational, and therefore weak. I don't say this to provoke your ire, I and others have highlighted the many fallacious arguments, and you have chosen to hand wave those objections away. 

I have heard apologists claim that the deity they imagine to be real, transcends logic. I think the irnoy of the claim, as well as the truth of it, is lost on them.