I don't believe in any beings with supernatural or magical powers. No gods, witches, chupacabras, baka, ghosts, spirits, demons, werewolves or mermaids. No psychics. No life after death, ESP or aliens abducting people out of their beds. None have ever been shown to be real, after thousands of years of investigating.
It would be interesting, even wonderful, if someone could someday provide evidence or proof of any of those things. When they do, I will change my mind.
On the other hand, in just a few hundred years after the invention of the microscope, germs were discovered, identified as the cause of disease, and methods developed to prevent or cure diseases caused by germs. I find it amusing that even people who pray to gods, and say they believe in the supernatural-- without any scientific evidence-- wash their hands before they eat.