Let's clarify, the word "supernatural" means, something outside of our understanding of the natural world. Anti-matter and black holes would have been considered "supernatural" just a few years ago. It is only because these anomalies have been observed, they are considered natural, because they clearly defy any scientific explanation. 500 years ago, lightning may have been considered "supernatural" because we had no "natural" explanation for it.
Currently, the concept of a God or Intelligent Designer, is indeed "supernatural," but that simply means it defies the laws of nature and physics within our known universe, not that it isn't real or possible. This is important to remember in a scientific perspective. Science is supposed to continue asking questions, not make conclusions. Motthead, and others like him, will easily make conclusions regarding "supernatural" things, or stuff that science can't explain. The human arrogance has always been, to assume what we know, is all there is to know.