"Sonship" is an important, yet often overlooked, theme throughout the Bible. Adam, the first human being, is identified as a "son of God"; Israel is God's "first-born son"; the covenant with king David is cast in father-son terms; Christians are children of God, "adopted as sons"; and the same designation brings Scripture to a triumphant conclusion: "He who overcomes will inherit all this, and I will be his God and he will be my son" (Revelation...