I wouldn't mind seeing God discussed in science class because it could well be true that God is responsible for life existing on earth, for order existing in the universe, etc.It may well be. But it isn't a scientific claim. It doesn't belong in a science classroom. Any more than the proposition that Xenu did it does.
Indeed. It's scientifically empty since it's trivially true: an omnipotent being could have created just about anything. It could even have created the whole universe while I was typing this sentence.
In other words it's stating the obvious about an entity whose existence cannot be verified empirically.
Gravity is like that, too. It never goes away. It's always been around. It'll probably never change. It could be used to explain anything. I mean, no gravity, no evolution! Maybe it shouldn't be in a science classroom either.