For a start, this from a similar thread in this 'religion' subforum;
Try this on for size ...
If Gawd ~ Creative Intelligence ~ Intelligent Creator ~ whatever, is as portrayed in most religions = eternal; that means no Beginning nor any End.
Combine with you can't get Something from Nothing, then the Intelligent Creator had to make the universe/cosmos from substance of Itself. I use "It" because if the entity is eternal and not in need of reproduction, it doesn't need to have sexes, such as He and She.
Those two together mean that a Big Bang will eventually become a Big Collapse; which then becomes another Big Bang, then a Big Collapse, on and on, no beginnings nor any ends.
That means we humans would also be eternal since we are made from the substance of the Intelligent Creator. If we have souls, than they would be eternal. Reincarnating into new bodies each time as we progress through the physical phase(s) of our existence. Bodies being like another suit of clothes, only in this case another suit of 'meat'.
If not the above, then back to the quandary of what existed before this Universe was created and what exists after it is uncreated = gone ???