Naturalism could demonstrate the existence of things that today are called supernatural. Ghosts. Demons. Deities. All of these things could be demonstrated

Naturalism could demonstrate the existence of things that today are called supernatural. Ghosts. Demons. Deities. All of these things could be demonstrated naturalistically if they were observable. In that case they would no longer be "supernatural" but they would still be qualitatively different from what is today understood to be "natural phenomena".