Sure, although because so much of those sciences are mathematically based, you're perceiving models based on the real world, not the real entities themselves. It's still all based on things that actually exist, or can be reasonably thought to exist based on the math.
That brings us right back around to God because God cannot be reasonably thought to exist. There is nothing that suggests the factual existence of the supernatural.
There is no "supernatural" or "paranormal".
If it exists then there is a science behind it. That's like suggesting that electricity didn't exist, or was a supernatural/paranormal phenomenon,
until we gained an understanding and knowledge of it. The universe is vast and infinite, much of it outside of our current, limited (yet expanding) understanding and knowledge. Nothing is outside the realm of science, only outside of our current scientific knowledge. Sure, based on current evidence and scientific knowledge, it's reasonable to reject god concepts (especially those commonly put forth by the usual religions), but we can still play with concepts, models, hypotheses, etc.
But back to mithril example that you never addressed:
Also, let's say we had an 800 pound weight made of mithril. Even though it's a fictitious material, we can still logically conclude that, if it were real and dropped on your head, it would crush your skull. Right? Right.
So we know that while mithril doesn't actually exist, the model still works since weight, physics, physiology, etc. obviously have real world examples. Likewise, if we present a model of an entity that possesses infinite intelligence and logic, we can still determine that it wouldn't behave in an unintelligent or illogical manner
even if such an entity doesn't actually exist due to intelligence and logic being a real world thing.