* John (Jack) Thomas: The book's protagonist, a young boy who is thrust into the role of a preacher after his father dies. He struggles with the expectations placed upon him and his own doubts about God.
* Martha Thomas: Jack's mother, a strong and resourceful woman who is fiercely protective of her son. She wants Jack to succeed as a preacher but also tries to shield him from the pressures of the role.
* William "Bill" Thomas: Jack's deceased father, a respected preacher who died in a tragic accident. Jack is haunted by his father's memory and feels compelled to live up to his legacy.
* Rachel: Jack's love interest, a young woman who is also struggling with her faith. She challenges Jack's beliefs and helps him to see the world from a different perspective.
* Jeb: Jack's friend and confidante, who is skeptical of religion but provides Jack with emotional support.
These are the main characters, but there are also many other important figures in the story, including the church elders, Jack's fellow classmates, and other residents of his small town.