I will prove to you that God exists

[Angrboda]

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

I'm not sure that a self-caused universe is significantly less plausible than causality operating outside time. Both seem pretty wild ideas. A self-caused universe would be eternal.