Drag
The dialogue is silly. The possessed kid/person just says the same shit over and over again; "they are gone", "their soul is rotting in hell", "they are not here" blah blah blah. Despite that being witnessed not to be the case several times.
I can almost imagine the director saying "make a really mean face and say this" and whoever's playing the possessed character at the time saying "Isn't that the same line we used befo..." and the director saying "We couldn't think of anything else horrible to say so just do it!".
Oh and it sometimes has telekinesis and sometimes has psychic abilities and sometimes doesn't, whatever the plot requires. Snore.