I don’t believe in physical matter. We are all imagining this together within the confines of God’s laws.
Basically you're correct. 'Physical matter' is composed mostly of empty space.
For example:
Say you place a marble, representing the nucleus of a Hydrogen atom, on one goal line of a football field, and a ball bearing, representing the electron, on the opposite goal line. THAT is what a Hydrogen atom would look like on the quantum scale. Mostly EMPTY space. So 'matter' is relative to the scale you're talking about. Every nanosecond billions of atomic particles are going right through our body and we don't even know it as they're going through our body's 'empty space'.
*** We are all imagining this together within the confines of God’s laws.***
That may well be true. As least the part about "within the confines of God’s laws".
I do believe in the Big Bang but that doesn't preclude God from being involved as 'something' had to make the Big Bang happen (and God said: Let there be light), and 'some one' had to make the Singularity 'explode' in the first place.So we could be like a huge Ant Farm (how big is 'the Universe' to an ant?). Or 'we' could be like some super-duper Computer Game like 'Sim City' that God's playing.
And I don't think 'we' are ever meant to know that.