There is a lot we don’t currently understand about the Big Bang and the universe, for instance the possibility of additional dimensions beyond the four we see, for example. Why dismiss a priori that science through its methods might enable us to understand more of these matters? What Newtonian physicist would have believed Einstein’s theory of relativity or the Heisenberg uncertainty principle? Faith and science are not contradictory, so I feel no qualms if science were to expand our concept of the Cosmos even further beyond the Big Bang.
“Why dismiss a priori that science through its methods might enable us to understand more of these matters?”
Because it is, by definition, not science. Computer models speculating about unobservable and untestable conditions do not constitute science, because they can never be confirmed of falsified.
“What Newtonian physicist would have believed Einstein’s theory of relativity or the Heisenberg uncertainty principle?”
That’s irrelevant, because Einstein follow the scientific method, so any scientist who objected to his theories would be easily shown to be in error. Big bang theorists do not follow the scientific method, therefore, they can never silence the criticism.