My Prediction: The boy ghost isn't "evil." He's UPSET and JEALOUS that his mother apparently replaced him with another baby. Just you wait.
Only once, I'd like to see a ghost on this show that actually is evil, that instead of seeing "the light," s/he sees fire and brimstone and is dragged, screaming, towards it at the end, while Satan laughs in the background.
Only once. That would make me happy. This show sucks. So. Very. Much.
ETA: Okay, I was wrong. But the real reason he was upset was just as freaking lame. Gawd.