Re: American Horror Story Discussion (Spoilers)
The show does set its own rules when it comes to the ghosts. We know that at least the spirits assume a human form in that they're visible as well as tangible (so human they can even mate with and impregnate living persons, commit murders, be arrested by police officers, touch and throw objects, etc.). So the traditional definition of "anti-Christ" may not even apply to the story.
"I don't know half of you half as well as I should like; and I like less than half of you half as well as you deserve."
--Bilbo Baggins, LOTR: Fellowship of the Ring