That doesn't disprove what it can prove. We know the universe used to be very hot and dense and expanded and cooled.
What I don't buy is that because we don't understand something -- like what came before the big bang -- that it necessarily implies the existence of some old white bearded cishet white male who cares about our day to day lives.
I'm perfectly happy with having absolute uncertainty about what came before the big bang. There doesn't need to be any explanation, and there certainly doesn't need to be a religious explanation.
And there's the straw man. I don't think anyone is arguing for the existence of such.
It seems you have some misguided (and caricaturic) presumptions, but those should not blur your thinking
The fact that we exist necessarily implies a Creator. Just because you're happy putting your head in the sand does not mean that reality will disappear when you do.