Gravity

Since the universe is closed, gravity can do it’s job of attracting things, objects, whatever.

You can assume or I could assume that , referring to the genesis story, God separating the light from the darkness used Gravity to do it. A really little dot causing the Big Bang doesn’t make sense.

One can only theorize that the dot wasn’t a bang at all, but the movement of energy from the dark into another area causing the light.

Lots a luck with this idea.