I often wonder about this, as I do about secularist who seem convinced the universe (time space and energy) began from nothing with the Big Bang. The very suggestion that time had a beginning suggests time, which is a paradox. If, as the evidence suggests, the universe is expanding, it surly must be expanding into "space". Energy cannot be created or destroyed but can change form. Why assume this has ever been any different? It's perfectly plausible that pre Big Bang energy resembled nothing recognised now.
What does an infinite regress mean for a pre Big Bang existence anyway?
Roger Penrose on "before" the Big Bang
Bearing in mind that Penrose would have thought "before" the Big Bang unthinkable a few years ago, not that he or anyone else really knows.