Not exactly.
If it's taking place as an event within our known universe, then I see no reason to say it isn't "natural". I mean, we could call a red apple a watermelon all day long, or claim it has powers and abilities ... but objectively speaking, "it is what it is" and it exists within what we consider "natural". Even if the apple began to dance around and sing show tunes and heal the sick with a wave of it's stem, it's still taking place within our natural environment. It may be extraordinary, and the evidence may point to something extraordinary, but it's still taking place within nature. Therefore, it's natural. It is operating off of SOME physical principles. Albeit ones we don't understand yet, or recognize as being normal. Assuming the definition of supernatural involves not being subject to physics of our universe, and pertaining to things outside nature ... I don't see how one could show conclusively such an influence was at play, if no other reason, by our place in the natural universe. If one wants to believe it is at play, okay ... but why not believe flying spaghetti monsters are at play also ? Thus, I see the term "supernatural" as irrelevant.
Let's say we can theorize and show mathematically that other universes exist that have copies of ourselves, other versions of ourselves running around in their own causalities, etc. That's great. In that sense, it COULD be considered supernatural. But if we can't go there, or interact with that environment, or experience it on any level whatsoever, or have it manifest in our own universe ... it may exist, but it's existence is largely irrelevant since it has no bearing or impact or influence on anything in our own. In that sense, call it "supernatural" if you wish. BUT ... the moment it has an effect on our universe in any way, even in a single instant, it is no longer "separate". It's not above our nature, or outside of it, or not subject to the physics that involve our natural environment. If nothing else, in that single instant, it was. It is now part of our causality. It had an effect. There was an event. It's now part of our natural environment. It's origin may not have been ... but even that is speculative now, because of our own placement in our causal chain. Since we were not there at the beginning of our causal chain, how can we be certain that the "supernatural" universe wasn't also there at that point, or before it, or that one didn't emerge from the other ? So even then, the idea it's "supernatural" seems unnecessary as well as self contradictory. It's a matter of belief, and so again, one could argue there are supernatural turtles which everything is balancing on top of, all the way down. I don't see the relevance.
I'm reminded to grab an Angry Orchard later today.
Can you prove this claim and/or provide evidence for it ?
I said I'd have to think about it because it's a generalized statement that has some semantical points I may or may not agree with. For example, evidence may speak for itself and thus "It is what it is," regardless of whether or not someone is convinced by it completely. My testimony on the witness stand may not be completely convincing evidence in a consistent manner (for example, I may not communicate well, or I may give the impression I'm dishonest, or others may have a different account from mine and seem more convincing) for any number of reasons, yet it still may be factual and correct. Examples like that is why I would have to think about your statement and on what levels I agree or disagree with it.
All in all I don't think I've ever said in this thread "The supernatural doesn't exist," rather, I think the term is misleading. The context which it is often used deals with things that are happening in the natural, and to differentiate between the two in the context the term is typically used, given it's definition, seems contradictory to me.
"If an orange is a lizard, that's supernatural," for instance.