Murphy's character, G, is a simple street bum who appears on the side of the interstate in a white cloak just in time to save the souls and heal the spirits of two money-hungry home shopping executives who are stuck with a flat tire.
G is a simple man on a spiritual pilgrimage.
He has no Social Security number or driver's license. He comes in peace. He thinks they should get the heck out of there. After backing up his car and almost running over G, he soon realizes that G has fainted and needs to be taken to a hospital. The rest is so elementary that you could probably figure it out without even seeing the movie and save yourself some time to boot.