God has become discontented with the human race and is contemplating chucking the whole thing and starting over, much to the delight of the Devil. At the Classy Chassis, a working class bar in Detroit, God wishes he could find just one soul who would show him the world was worth saving. God asks the Devil to pick anyone. The Devil picks Bob Alman, an auto worker with an attitude.
God and the Devil make a deal that if Bob can show God that the human race is worth saving, he will spare the world. They approach Bob, who is skeptical. But after God proves to Bob he's the real thing, Bob agrees to help out. Bob quickly becomes dismayed when he realizes that God isn't going to tell him what he has to do. Bob has to figure that out on his own.
At home, Bob's wife Donna is having trouble communicating with their 13 year old daughter Megan. Bob tries to tell them about meeting God, but they completely ignore him. Bob tells his 5 year old son Andy, who is unimpressed. Bob tries to get God to let him out of the deal, but God refuses. Bob decides to spread God's word by gathering people in his back yard. Unfortunately, no one is interested in what he has to say.
Meanwhile, in the Lava Lounge in Hell, the Devil reveals to his sidekick Smeck that if he destroys Bob, the world will be destroyed with him. Back on Earth Bob tries to pitch a show idea to the "Blessed News Network," but when they realize they won't make any money from the show they turn him down.
Bob gives money to a homeless person and is convinced this deed will satisfy his end of the bargain. But God informs Bob he's going to have to do more than that. Bob doesn't know what else to do, until Donna comes into the living room in tears. She is upset because Megan has locked herself in her room and won't talk to Donna. Bob takes Megan to a nearby mall and manages to get Megan to open up.
Back at the house, God congratulates Bob on his first success. He's not done, but he's certainly on the right track. The Devil shows up on Bob's front door disguised as a sexy woman, but God tells him to give up – it's too late.