I’ll try…
Imagine trying to paint a picture of the Universe and everything in it.
When it’s finished, you realise something is missing, that is you painting the picture of the universe, so you paint yourself and the canvas into the picture.
Looking at the painting, you realise that there’s still something missing, that is you painting the picture of you painting the picture of the Universe, so you paint yourself painting yourself into the picture.
Looking at the painting, you realise that there’s still something missing, that is you painting the picture of you painting the picture of the Universe, so you paint yourself paint yourself painting yourself painting yourself into the picture…
Every time you do this is a layer of regress.
So, to explain how the Universe got here, you propose a God of the gaps, an argument from ignorance. That conveniently explains how the Universe got here without hurting anyone’s head to much, but all you’ve done is regressed a layer.
**You then have no explanation of how God came to exist. ** Was God created by another creator, and his creator by another and another and another?
You either end up with infinite regress, or you have to stop passing the buck and admit at some point that we just don’t know how the Universe has come to exist.