folks in the future may say the same of us in a few hundred or thousand years, as scientific progress seems to be moving at a faster pace.

I expect they will, providing we're still here. In the meantime we have to make the best of what we know.

So, what is the actual risk ( as you note) of such a gamble to a belief in a God?

I never actually mentioned a risk; I was talking about odds and logic, but since you ask, the track record of religion so far hasn't exactly been trouble-free.

On an individual basis, however, so long as people keep their beliefs to themselves and don't seek to control, influence or assume superiority over others I don't think it's a problem. Unfortunately that isn't what happens, and there's your risk.