From Wikipedia:
The film stars Philip Seymour Hoffman, Joaquin Phoenix, Amy Adams, and Laura Dern. The plot involves a religion called "The Cause" which has been compared to Scientology. The Master is scheduled for release on October 12, 2012.
A charismatic intellectual (Hoffman) launches a religious organization following World War II. A drifter (Phoenix) becomes his right-hand man but as the faith begins to gain a fervent following, the drifter finds himself questioning the belief system and his mentor.