The Gospels present a sweeping, holistic view of the lives Jesus calls us to lead as His followers. But modern-day Christianity tends to sell this message short: We go about our daily routines believing that if we live morally, respect each other, and believe in Christ, we’re all set. Unfinished, the latest book by Richard Stearns, president of World Vision U.S., presents a more complete model for what it means to follow Christ: “Believing is only the beginning.”...