I will prove to you that God exists

[Sheldon]

That's an argumentum ad ignorantiam fallacy, it is fallacious to argue that anything is true because we lack an alternative explanation. It is also an objective fact the the universe and natural processes exist, but there is no objective evidence any deity or anything supernatural exists, or that they're even possible.

The universe and natural processes do exist. But they didn't cause themselves to exist right? 

Oh, and how do you know this? 

The evidence of a Creator is the fine-tuning of the universe for life. I just wrote a post detailing some of that.

Circular reasoning fallacy, you are begging the question. Please demonstrate objectively verifiable evidence that the universe is "fine tuned", otherwise I have to remain dubious. The fact we lack a complete explanation for the origins of the universe past the point of the big bang, does not in any way evidence your claim it was created, or required creating. 
And before you posit a deity, you would need to demonstrate sufficient objective evidence a deity exists or is even possible. The claim a deity did it, also has no explanatory powers whatsoever.

I don't believe the universe has been finely tuned, but even if it had, this is not in and of itself evidence for any deity, why would it be?