Children of Satan (2019)

Two paranoid, God-obsessed little girls are asked to welcome a new arrival, Erna, at their Christian summer camp. Erna's strange behaviors– blank stares, convulsions, mutism– lead them to become certain of one thing only:
She must be possessed by Satan. Children of Satan is a story about children's desire to belong, their overactive imaginations, and how a combination of the two can quickly become fatal.