I'm not sure if this qualifies as the supernatural (it exceeds natural capabilities, imho), but while lots of people no longer have a fundamentalist belief in religion, it seems a fair number of people have in some sense replaced that with a somewhat fundamentalist belief in the capabilities and comprehensiveness of knowledge (versus theories) of science, free markets, human nature, and other things like that. And on a personal basis, a possibly overly confident view of the correctness of their beliefs about the beliefs (and underlying motivations) of other people.