Elmer Gantry (Burt Lancaster), a drunken, dishonest street preacher allegedly patterned on Billy Sunday, wrangles a job with the travelling tent ministry conducted by Sister Sharon Falconer (Jean Simmons).
Thanks to Gantry's enthusiastic hellfire-and-brimstone sermons, Sister Sharon's operation rises to fame and fortune, enough so that Sharon realizes her dream of building her own enormous tabernacle.
These ambitions are put in jeopardy when a prostitute (Oscar-winning Shirley Jones), a former minister's daughter who'd been deflowered by Gantry years earlier, lures Gantry into a compromising situation and has photographs taken.
It took several years for any Hollywood studio to take a chance with Sinclair Lewis' novel, and when it finally did arrive on the screen, producer/director Richard Brooks was compelled to downplay some of the more sacrilegious passages in the original.
Also appearing in Elmer Gantry are Arthur Kennedy as an H.L. Mencken-style atheistic journalist, and Edward Andrews as George Babbitt, a character borrowed from another Sinclair Lewis novel.