Atheism and the meaning of life - what drives you?

[Ahriman]

Let's pretend for a moment that the universe as we know it doesn't exist and for the sake of argument, only a god exists.

The only thing in existence is a god. Nothing else.
For all of eternity only a god exists.

Does that make any sense ?

It's difficult for me to picture in my mind but that is precisely what many Christians believe, so yes, I can imagine this.  But I can't stop wondering where this god came from.

Who cares/why does that matter. There are more important elements to consider.