I think both sides on this argument are wrong. Putting it in classical faith V science terms, scientists will often claim to know absolutely that no such things exist due to certain natural laws, but that's the very point of the term "super"natural. When you are talking about the supernatural, by it's very definition, the established laws of our reality are not certain to apply. The "faithful" will often claim that the supernatural is everywhere, which quite frankly, it isn't. There are certainly more hoaxes than any of the other "unexplained" cases, to suspect the supernatural without extensive prior investigation into other, more likely possibilities is extremely foolish.
I think we should learn to accept, as part of our own humanity, that the only thing we really know of these matters is that we know nothing.