When Jesus is crucified, which is contrary to what Judas and everyone else thought was going to happen, Judas feels awful (to put it lightly). This is where the action of our play picks up. While Judas is feeling all of the possible guilt and remorse one could ever feel, Satan approaches him and convinces him to kill himself. Judas dies without witnessing Jesus’s resurrection and without witnessing the mass-forgiving of all of humanity’s sins.
Jesus’s death and subsequent resurrection has two results: 1) It provides salvation for humanity, and 2) it officially begins what becomes the Christian Church, left under the direction of Saint Peter and the rest of the surviving Apostles.