RACE WITH THE DEVIL is one of those movies that played on several Friday or Saturday nights when I was a young boy during the 1980s. According to the wikipedia entry RACE WITH THE DEVIL was released in 1975. It would fit right in with some 80s movies like Mazes & Monsters, Witchboard, etc. that used Witchcraft and/or Satanism as part of their horror.
The plot of RACE WITH THE DEVIL is pretty easy to follow. Two couples are on vacation in a RV and camp for the night. The men run across a ritual where a woman is sacrificed. They get noticed and chased throughout the rest of the movie. I remember bits and pieces of this movie but what really caught in my memory was the ending. No spoilers; see for yourself!