Good Against Evil (1977)

After a promising and eerie beginning that steals much from To the Devil a Daughter (1976), the film attempts to take the premise in a new direction but quickly runs out of momentum.
The characters are flat and the twists and turns neither twist nor turn.
It picks up again near the end to become a poor man’s Exorcist (1973), and while it does the anxious priest routine well enough it’s all rather pointless when you can just watch the original film.
A TV series was planned but didn't appear, so there's an open ending.

1½ Satanists never laugh on film out of 5