The Wicker Man
1973

Police Sergeant Howie, a celibate devout Christian, is sent an anonymous letter insisting that he investigate the disappearance of Rowan Morrison, a young girl, on the remote island of Summerisle.

He flies to the island and discovers, much to his disgust, that the entire population of the island participate in paganism, engaging in fertility rituals, and worshipping the sun. He sees people copulating in the graveyard, and children being taught about the phallic significance of the maypole.

The islanders claim never to have heard of Rowan, so he eventually gets permission to exhume her body from the graveyard. Instead of her body, he discovers the corpse of a freshly killed hare, which has many supernatural overtones. Further investigations lead him to believe that Rowan has been sacrificed to appease the "gods".