Ah, there is quite the symmetry I was talking about. We see things fall and theorize that is gravity operating. And we also see the created world and theorize that is God operating. Neither is a direct observation of the underlying operator, but both are equally reliable observations of the operator's effects.
So, in either way we have a theory, a man-made creation, that "explains" the world around us. Except that more people agree on gravity than on God for obvious reasons: gravity always gives consistent results; our appeal to, or defiance of, God doesn't. So, while we can predictably subject gravity to test, God is not readily verified by experiments.
The result is that we know what will gravity do, while with God nothing is certain. Thus, our "belief" in gravity is actually a certitude for all practical purposes, while our belief in God is "substance of things hoped for, evidence of things unseen," [Heb 11:1].
Gravity is part of this world; God isn't. Gravity affects the world physically. God affects us spiritually. From gravity we learn that things fall; from God we learn mercy, love, justice, etc., "things" not subject to physical laws or evident in nature.
Apples and oranges, as I said.