G.O.G. ? Reminds me of this old Rick Griffin cartoon:

Which god or gods? Logically, if there are many gaps, then there must be a god/goddess for each of them. As for why the gaps, this must lead to a god of faults, one which perhaps has little experience or skill in creating everything, or lazy. Knocking off work after say six days then taking a 14 billion year (and counting) tea break rather than doing a proper job.
Have you been mis-created by an incompetent deity? Holes in creationism? Then pray toll free to 0800CTHULU...

The gaps are sufficiently wide enough to fill with god or anything else you choose.

Only if your god is getting ever smaller all the time, and is now only a thousandth the size it once was.

If we don't understand something it doesn't mean God did it. Aron Ra made a very good video on this subject. Link is below.

Dog gaps!!!