Science is based on the belief that if you can repeat an experiment, it must be true. But who has proved the existence of truth? Who has proved reality?
Science has, through thought experiment, created the laws it says govern the universe. It has also created another set of laws to explain the difference between the reality the physics of science predicts and the reality that we all perceive ... and this second set of laws is more mind-bogglingly wierd than any description of divine creation.
It may be, as I have heard recently, that the uncaused and spontaneous emergence of a material universe where there was nowhere before, and no before until afterwards, is an inevitability, because "non-existence" is such a volatile condition that something is bound to happen. But that's just another thought experiment, not a statment of what is, or was.
It may be true that everything is because it always was and ever will be, but neither believers nor many scientists support that idea (which might be a point in its favour).
But I suggest that the creation of everything out of nothing by no Prime Mover is just as preposterous an idea as the one that says God started work on Sunday, finished on Friday, and spent Saturday watching football.
So, Thorne, if you decline to attempt to prove the non-existence of God, I challenge you to prove the truth of an uncaused physical universe.