Also, I have used, and continue to use Ouija boards fairly regularly as a party game, and to show people how they don't work. Just for s&g, try blindfolding someone and asking them to use it (hint: it all comes out as gibberish). I have never in all my years had one negative experience with a Ouija board, nor have any of the people I have used one with.
While I agree that science is not some oracle that has the answers to everything, it is the best tool we as human beings have for understanding causality.
The problem, as it were, with trying to explain something for which no evidence exists, by using evidentiary terms, is that you have to find external validation for something that is by and large an internally held belief. Or to be less prosaic, trying to explain something which has no physical prescence, by using terms which describe the physical world, is, by definition, impossible. To say that demons are energy beings that feed off of energy, but some type of unknown energy that can neither been seen or measured, falls into the realm of myth, not fact.