Creation VS Evolution

But we don't know that much about water, but there are results we understand regarding it

I think you're overestimating how much is actually known about gravity.
We don't understand anything about gravity other than A) it pulls things with mass together and B) It (probably) curves spacetime. And we're not even sure on that second thing, because it pineapples up quantum mechanics, which has a lot of experimental evidence in favour of it.

I think what you were talking about when you said
[quote]When Gravity is involved in empty space, matter spontaneously creates because it's so unstable when gravity is involved. That's at least what I could gather from his explanation. In fact when theists argue against this they decide to argue the semantics of what "nothing" actually is.[/qupte]

Is the zero point energy of space, which is more of a quantum mechanical effect rather than a gravitational one (To put it simply, one of the uncertainty principles, the energy of any point over an amount of time of any given space can only be measured to within a finite limit, meaning each space has an amount of energy which then can form a small mass for a period of time). This is one of the main things that actually makes matching QM with Relativity difficult.

Oh hey, perfect day for this comic to have come out.