What are the motifs in Prentice Alvin by Orson Scott Card?

Good vs Evil is a recurring idea in the story. The series "The Tales of Alvin Maker" is essentially the story of forces of good versus forces of evil. Alvin represents the legendary hero, the man who has the power to oppose the forces of evil and let good triumph. In keeping with many legends about such a hero, Alvin has a nemesis, an evil being called the Unmaker, who is like the devil.