So a girl mother dies. Mom becomes an Ancestor. The girl wishes to communicate with her mom (Ancestor). The girl contacts her mom and somehow the devil intercepts the communication and possession ensues.
Christian propaganda at its finest.
I'm not sure how Ancestor communication is related to "devil worship", yet here we are. Christians and Catholics have brought more destruction on people of color, and humanity as a whole, than any Voodoo or Santeria practitioner could ever dream of, yet here are; the traditional religions being "demonized".
The movie is a good movie for purposes of entertainment; but communicating with our Ancestors are the least of our worries as it relates to evil and being "punished by God".