As a film it's O.K. The acting is good even above par for a couple of the cast. This isn't really a horror in the conventional sense. No gore. No jump scares. No demons. No items of cutlery sticking in the ceiling.
It's an exploration into belief, mental illness and how people react to these things. For instance, if someone hears the voice of God, how do we know that God isn't talking to them? It was personal to me. I had a friend who was very religious. He went to church and was part of of that community. He said that he prayed every day and everybody loved him. Until God answered him, then he was considered mental. It wasn't as if God was telling him to do something bad, just good things. This film goes into that in a bit more depth. What happens if someone hears the voice of God and it's telling them to do something bad? What if it isn't God and they aren't insane? If you like delving into these sort of questions, this is a film for you.
It's not fast paced but moves along nicely. It does keep asking those questions.