Insurance salesman Clarence Hilliard denies the existence of any supernatural deity and proclaims himself God. Forming the Eternal Man Party, he becomes a rock and roll evangelist to gather converts to his cause, among them an elderly woman who agrees to finance his activities. He enters politics, but begins to doubt himself when his mother dies and his wife and daughter leave him. After violating a religious object he has stolen from a church, Hilliard challenges God to reveal himself. A miracle proves Hilliard's human fallibility, and he repents.
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"Iconic character actor and inimitable personality Timothy Carey's eccentrically flawed, indescribably lowbrow, and madly egocentric, yet indelible satire, The World's Greatest Sinner, is a commendable exposition on opportunism, moral bankruptcy, and idolatry as a bored insurance salesman, Clarence Hilliard, re-invents himself as a youth attuned, hip-gyrating pop star in order to gain public exposure and build a constituency base for his political ministry. Renaming himself "God", Hilliard's decision to run as a presidential candidate under the un-substantive, but universally appealing platform of personal empowerment and eternal life - and in the process, attract an ever-widening circle of fanatical followers - serves as a patently bizarre, deliriously kitschy, and idiosyncratically disjointed portrait on spiritual desolation, existential vacuity, and monomania as the once seemingly grounded Hilliard becomes estranged from his family and faith under the intoxicating, corrupting delusion of power." - FilmRef.com