Given that a batch of religious-themed horrors (Stigmata, Lost Souls, Bless The Child) crept out and died in 1999, it's amazing anyone should return to the well-trodden secret libraries of the Vatican and attempt yet another murky mix of barmy theology and body count terror.
Brian Helgeland regroups his Knight's Tale cast, whether they fit their roles or not. Heath Ledger has his silliest lead to date as a designer-stubbled, hunky, demon-busting priest; Shannyn Sossamon blows her Rules Of Attraction cred as a formerly possessed mental patient who becomes his love interest; and Mark Addy bumbles along as an Irish clerical hardman. Also in for the shame are Benno F³rmann as the eponymous goateed tempter and Peter Weller as the camp, mad cardinal who plans to be Pope.
The sin eater myth offers all manner of interesting plot angles, but this fails to make sense even on a level of how characters get from one place to another let alone how they solve the mystery.