Nicole Kidman could be blackmailed by Scientologists if she speaks out against the religion. It is believed to be the cause of her failed relationship with Cruise and her silence is because of the threat of being unable to see her two adopted children. A‘tell all’ book by Andrew Morton reveals that Cruise participated in a ‘potential source/suppressive person’ course where the Roman Catholic Kidman was identified as being a possible source of problems due to her psychologist father and her lukewarm attitude to Tom’s faith.