“The Story of Marjoe”, a feature-length documentary directed by Howard Smith and Sarah Kernochan which tells the life story of evangelist Marjoe Gortner. It won the 1972 Academy Award for Best Documentary Feature.
Plot Summary from http://www.imdb.com/title/tt0068924/plotsummary:
In this revealing documentary, Southern evangelist Marjoe Gortner allows the filmmakers to record him swindling people out of money. Raised to be a child preacher on the revival-tent circuit, Gortner made a small fortune for his parents. Later, he began preaching on his own in a lively, rock star-influenced style, but, since he lacked actual religious faith, money became his sole motivator.