I will prove to you that God exists

[Drew_2013]

In the book you refer to he fields the hypothetical that universe had to be as it is. He rebuts the hypothesis because it begs the question why if a universe has to be in a certain configuration, why is it the narrow configuration that causes planets, star, galaxies, molecules and ultimately life to exist. It doesn't solve the problem only pushes it back. That's why he continues to believe in multiverse theory.

In Just Six Numbers, Martin Rees does not use the phrase begging the question a single time.   I'll need an actual quotation before I comment on this.

Given that I've just shown you misrepresenting Martin Rees, it's not a stretch to imagine that you are doing so again.

(Other words Martin Rees doesn't use as you've used them here:  'solve', 'problem', 'push', and 'back'.)

If the underlying laws determine all the key numbers uniquely, so that no other universe is mathematically consistent with those laws, then we would have to accept that the ‘tuning’ was a brute fact, or providence. - MR

I accept the fine-tuning of motherboards as a brute fact because they are intentionally designed to come out fine-tuned for computing. The fact they are caused to be fine-tuned doesn't mean they're not fine-tuned.

I think you get this now only a person of low intelligence would fail to see it.