As far as I can see Shim, nobody can prove anything about the origin of the universe.
From Cornell University via Google.

"First, the Universe might have what we call positive curvature like a sphere. In this case, the Universe is called "closed" and it has a finite size but without a boundary, just like a balloon. In a closed Universe, you could, in principle, fly a spaceship far enough in one direction and get back to where you started from.

The second possibility is that the Universe is flat. This kind of Universe can be imagined by cutting out a piece of a balloon material and stretching it with your hands. The surface of the material is flat and not curved. You can expand and contract it by tugging on either end. Flat Universes are infinite in extent and have no boundaries.

Finally, the Universe might be "open" or have negative curvature. Such Universes are also infinite in spatial extent and have no boundaries.

Thus whatever be the shape of the Universe, there is nothing called a boundary and hence nothing called the edge or end of the Universe."

It is all "educated guesswork", and beyond our comprehension, and likely to remain so until humanity becomes extinct in say, a couple of hundred years?

Would we not be better concentrating on ways to make life on earth sustainable? This problem should be within our mental capacity, all we need is the will, and possibly a little bit of "faith".