The Replacement Child(2008)

Overview:

After spending a year in a juvenile center for beating up his stepfather, Todd Turnbull returns to his backwoods hometown a repentant, deeply religious boy. When he finds his best friend, Michael, withering away without any medical attention due to the family's spiritual beliefs, Todd must make a choice: let his friend die; or break his oath of non-violence and take matters into his own hands.