Earlier quoted context omitted.
That’s tautological. We observe the effects, and assume they must propagate backwards under rules we think we know, then say that the theory must be true because we observe the current state is the forward propagation under those same assumed rules. It’s unfalsifiable and accordingly uninteresting.
The reason why we assume the same rules is because 1) we haven't observed anything that implies that they changed, and 2) if we assume that they did change, then any attempt to figure out what really happened is moot anyway. From a religious perspective, there's a take in e.g. some mainstream Islamic madhabs that time is an illusion that is caused by God literally recreating the entire universe moment after moment. H…
And yes, any attempt to figure out what happened is moot. As you detail in your second paragraph. I don’t think much of it one way or the other, besides to interject when someone makes any sort of claim that “the science” points to their particular faith’s origin story.
Can you give an example of any of the practical use cases for the Big Bang origin story?