What would evidence of a God even look like?

[Esquilax]

And you think what you are made off and walking around on is "physical"?  It's 99.999999999% empty space occupied by the movement of an extremely tiny amount of physical matter.

... Yes, and that specific arrangement of empty space and matter is what we call "physical reality." That is how we have defined that: simply laying it out in greater detail doesn't separate it from its definition.

In fact, the empty space itself is still physical, since we don't define the physical world simply by whether or not it has stuff occupying it. For example, the space between the walls in my house is still physical space, it's not metaphysical. Hell, even the vacuum of space is still physical space, not metaphysical.