i believe there are entities out there, these entities are intelligent creatures and will often call themselves what would be easiest for their contact to understand...so yes, i believe a devil is a high possibility for reality, people may have talked to devils, but one persons devil could be another persons ghost...but as in the christian sense of one whose pure evil, seeking to tempt man to turn from god for some revenge factore of being made inferior to humanit, no, not really...there is the possibility that is indeed reality...but until i die and know for sure i'm sticking with the "i believe it's possible, and anyone can be anything their mind can conjure."