"The idea that our reality is formed by the chance happening of billions of years of an unguided mindless process."
Some things I know that you are okay with.
"We are stardust" from the Woodstock song is literally true. That's where the material around us comes from. Burned up stars. To get elements heavier than iron, which are required for life, stars have to go supernova. The biology and the physics can't be denied on this front.
We're here because stars have been forming and burning out or exploding for thousands of billions of years. And there's not really a sensible argument against this, and like a Library of Alexandria in support. At the bare minimum, that's where all the stuff comes from.
So, the billions of years is there. And the unguided mindless process can be shown to do the same kinds of things over and over again when you start with the basic ingredients, stir it up, and let it cook a few billion years.
Another day, another billion dollar grift.