Hi Marilyn,
I've never tried a Oujia board, but did purchase a set of 'runes' and a book. It was pretty silly imo and am returning them. No supernatural stuff to it though.
I think Seeker sums it up well--the possibility of unexplained phenomenon doesn't have to be demons in the biblical sense.
"Extraordinary claims require extraordinary proof." --Carl Sagan
Cheers!
Pat