Priest (2011)

Priest, a western-fused post-apocalyptic thriller, is set in an alternate world -- one ravaged by centuries of war between man and vampires. The story revolves around a legendary Warrior Priest (Paul Bettany) from the last Vampire War who now lives in obscurity among the other downtrodden human inhabitants in walled-in dystopian cities ruled by the Church. When his niece (Lily Collins) is abducted by a murderous pack of vampires, Priest breaks his sacred vows to venture out on an obsessive quest to find her before they turn her into one of them. -- (C) Sony