Film where altar lamp goes out

I can’t remember much, sorry. But the film was maybe set in a school with church. Kids or adults went bad - evil. There’s a scene where the altar / tabanacle light goes out, indicating that God is no longer there. Maybe from 70’s or 80’s. Please help, thanks

I think it might be this. Has anyone seen it? If so, do you remember the sanctuary lamp going out??

Haven’t watched it but here it is:

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