Well, i watched "Fallen" and it was ok, but not as neat i hoped it would be. They spoiled it too much with the "i'm nasty and evil"-stuff. 6.5/10
However, by recommendations of the same genre, namely thrillers with cultish or mystical undertones, i sumpled upon "Angel Heart" (1987) with Mickey Rourke and Robert DeNiro. Now THAT movie had what "Fallen" didn't have; intruiging story (eventhough i figured it out very early on, i just enjoyed the ride), tremendous atmosphere and great sense of suspense. Plus, it has to have one of the most eerie endings that i know of, it really makes you feel uncomfortable.
9/10.