Is Quran the proof of God?

[robvalue]

So, lets take any random thing.

Demon teapots. They exist, it's just a matter of finding them. They must exist because I just wrote it down.

No. It's sensible to assume they don't exist, until you find them, or any evidence that they are likely to exist or to have existed in the past. Anything else is the argument from ignorance, as usual. Science doesn't deal in absolute certainty, it's a useless concept. Questioning absolutely everything to try and then achieve one specific unsupported goal is dishonest nonsense.

"Just because you haven't found them, that doesn't mean they don't exist."

True but irrelevant.

"Therefor, it's reasonable to believe that they do exist."

Not true. The hidden implication in any argument from ignorance.

Or the other formulation:

"Do you have the answer to this question?"

No I don't.

"Therefor, my answer is valid."

No. It's up to you to demonstrate your answer is valid. Whether or not I have the answer is irrelevant. "You don't know I'm wrong" does not equal "I'm right". You may indeed be right, but you've made no argument to convince anyone that you actually are.