How does Archibald MacLeish use imagery in J. B.?

Sarah's questioning of JB's faith and her suggestion that she and JB are taking on the weight of evil has hints of Christ imagery about it, specifically the belief in Christian theology that Christ died on the Cross to take the sins of the world onto himself. Sarah's departure represents both the departure of Job's wife in the original and the way in which those who lose their faith in God turn their backs on those who maintain theirs.