....until it actually does, that is.
Lightning: God. Then static electricity.
The sun: God. Then a ball of hydrogen gas.
The flu: God. Then a virus.
EVERY single time religion has purported to answer a question, science has stepped in to show how it really is.
IF the truth is that there is a limit, I can guaran-fucking-tee you it won't be religion to determine that truth. It'll be science that finally determines whether or not there is a limit. I suppose then religious folk can ascribe the final unknown to "god", but by then he'll be a god that doesn't control anything, doesn't really do anything, doesn't really have any power whatsoever, and quite frankly, doesn't have any reason to exist.
Two minor points to your excellent post: There is no sense in talking about "before" the big bang, because the big bang is when time itself begins. And 2: We DO know the general chemical processes that lead to life arising and the subsequent evolution of the species that eventually lead to us. We're just fuzzy on the details, which, given enough time, will eventually be discovered.