I loved this movie. The first half drew me into the setting and built up the tension beautifully. However, the ending left me slightly disappointed, as its dual meaning made it hard to discern which parts were intended to be the true conclusion.
The actors were amazing, with the three leads absolutely knocking their roles out of the park.
The setting was used effectively, and the subtle hints of religious origins and education were nice touches that added depth.
That said, the 'prayer doesn't work' quote felt a bit cheesy toward the end. I think those lines could have been delivered more effectively.
Overall, Iโd give it a 9.5/10. Highly recommended if you enjoy themes of religion or horror!