When forced to give up so much, the Joads question their faith in a higher power. Reverend Jim Casy, an honorary member of the Joad family, is a quiet man, but he is constantly thinking about God in The Grapes of Wrath and about the ways in which humans' souls are connected.
He's given up the priesthood, having been a lecherous and rule-breaking preacher, but he still deeply considers the existence of God and the importance of religion in uniting and inspiring people.
Questions About Religion
Is anyone religious in The Grapes of Wrath?
What role does Reverend Casy play in The Grapes of Wrath?
What does Reverend Casy want in life?
Chew on This
Faith is the only thing that allows the Joads to survive in the way that they do.