A Scientologist is an adherent of the doctrines and beliefs of Scientology, and Hollywood is full of them! Actor Tom Cruise, one of the most passionate adherents to this school of religious beliefs, is an outspoken advocate for the Church of Scientology and its associated social programs. So much is his passion for Scientology that it is said to have led to the end of his marriage to Katie Holmes! Being a recently developed body of religious beliefs, Scientology has also attracted its share of criticisms. But nothing can dampen the spirits of its faithful followers like the young actresses Elisabeth Singleton Moss who was raised a Scientologist by her musician parents. Despite the fervor shown by the ardent adherents, many prominent personalities like Diana Canova, John Duignan, and Paul Haggis who once followed Scientology later left the faith citing various reasons. Read on for more information about famous Scientologists.