They say because The Philosopher's Stone shows demonstrations of witchcraft the film isn't just a fantasy.
Ninety people have signed a petition asking for the film to be banned in their town.
'Don't watch it'
Julia Sparkes is leading the protest and she told the BBC Christians should be warned not to see it.
But the cinema's manager says the petition's a waste of time and the film is pulling in the crowds.
Meanwhile, it's just become the UK's most successful movie of the year.
It's topped the charts for a fifth week, after taking £2.4 million at the box office.