The Rite (2011)

American seminary student Michael Kovak travels to Italy to take an exorcism course. Disillusioned with his father, he decides to become a priest and abdicate his vows upon completion. However, after ordination, he writes a letter of resignation, citing a lack of faith. His superior convinces him to attend a class on exorcism in Rome. Michael reluctantly agrees and meets Father Lucas, a renowned exorcist. Skeptical at first, Michael witnesses supernatural events and eventually performs an exorcism on a possessed girl. After the girl's death, Father Lucas becomes possessed himself, leading Michael to perform another exorcism and regain his faith. He leaves Rome and becomes a priest.