It's about church leaders who cover up their dark personal lives. The girl is the daughter of the pastor who is asking her to act as if everything as alright even though he has abused her. The sanctuary hum is the congregation's concern and suspicion that some tinhgs aren't as they would seem. The part that says "god save us from your chosen ones" is saying that people want god to protect them from people who hold power in church and appear to be god's "chosen ones" when really they aren't good people at all.
It's about church leaders who cover up their dark personal lives. The girl is the daughter of the pastor who is asking her to act as if everything as alright even though he has abused her. The sanctuary hum is the congregation's concern and suspicion that some tinhgs aren't as they would seem. The part that says "god save us from your chosen ones" is saying that people want god to protect them from people who hold power in church and appear to be god's "chosen ones" when really they aren't good people at all.
That's just my interpretation.