I think that the poster "quietly leaving" makes a good point. In the same vein, there were once scientists who assuredly proclaimed that an atomc bomb could never be made, as it violated all the laws of physics. Unfortunately, they were wrong.
I also think that that the word supernatural does not denote something which is fixed or static; the boundary between the "supernatural," and the "natural" is in constant flux. What was once viewed as "supernatural" could possibly come to be considered later on as "natural." Conversely, the natural realm can "expand" so as to include what was previously considered as "supernatural."
I am thinking specifically of the constant advances made by scientists, especially physicists. If I am not mistaken, our words "physics" is directly derived from the Greek physis, which basically means nature [natura in Latin]. Moreover, if I am not mistaken again, what we presently call "physics" was once called the "natural sciences," understood in its etymological sense, as the "knowledge of nature." As I understand it, the term supernatural denotes what is above [or beyond] nature - nature as we presently can conceive it.
Just consider the concept of how many dimensions there are. Classically, there were three. And then Einstein proposed a fourth - Time. Now, I read that physicists are now conjecturing as many as ten dimensions. I understand the point that Narkissos is trying to make; and to a large extent, I agree with it. But I also wish to say that during my long life, there have been instances in which I saw things that I cannot easily explain. To paraphrase I verse from Shakespeare, there are more things in heaven and earth than I have dreamed of in my philosophy. Speaking personally, the things that I have seen distress me somewhat precisely because I cannot fit them into my rationalist world view. I wish that I had not seen them, or at least, I wish that I had a rational, logical explanation for them. Perhaps later advances in physics will provide an answer.
What is certain is that scientific knowledge is advancing, and doing so at an incredible rate. To use a rather hoary cliche, science fiction often does become science fact. I am willing to suspend [or bracket] my disbelief and concede that future advances in physics may one day be able to explain what we cannot explain today. Perhaps physics will one day offer an explanation for "supernatural" phenomena such as angels, ghosts, and "spirit entities."