Yes, 'The Exorcist: Believer' is based on a real - life exorcism case. The movie draws inspiration from certain events that are believed to have involved demonic possession. However, as with many movies inspired by real events, it also takes creative liberties to make it more engaging for the audience.
Definitely not. 'The Exorcist Believer' is a work of imagination. It doesn't have any roots in actual happenings. It's all about crafting a captivating and spooky tale.