The Church - MTV Unplugged DVD

In the Middle Ages, the Knights Templar invade a supposed coven of witches and they slaughter the community. They dig an unholy collective grave, bury the bodies, and build a church on the top of the corpses. Centuries later, librarian Evan is hired the organize the church's books and meets Lisa, an archaeologist who is researching the church's catacombs. He accidentally unleashes, and is possessed by, an ancient demon. Sooner several visitors are trapped inside the church and possessed by demons. Father Gus and teenage Lotte are the only persons that are not possessed, and Father Gus discovers a secret in the construction of the church that might be the last chance to save humanity.