Young man in Mid-West America thinks he is close to building a machine that can communicate with God. I think he has trouble funding the project or getting people’s attention so highjacks a bus (?)
Remeber he also had a brother / brother-in-law who had some sort of weird plan of his own. Something like convincing people to find Religion so that when World War 3 starts they would die thinking they would go to Heaven leaving more space on Earth for him and his family.
American movie, in colour made either 80’s or 90’s