If reality encompasses all that is, ever was, and ever will be, then God exists regardless of our knowledge of God.
But, can humans even know this? Seems like something that won't ever provide hard proof, and therefore is relegated to belief.
Trying to prove that which is not materially, linearly observable, like a patterning or God himself, is impossible. It must be inferred.
It seems to me religion is growing up. Christianity was fixed by Europeans to make it more like their own faiths, and is probably 99% Greco-Roman-Franco-Pagan, but it's simplified to make it exoteric (as Evola points out).
Thus we're heading toward a new faith, which is a lot like the old Hindu and pre-Greek faiths, but perhaps more Europeanized.