The bullet hole just inside the headquarters of Focus on the Family is carefully preserved, a reminder of that 1996 day when a gunman held four employees hostage at the nerve center of James C. Dobson's evangelical empire. According to a sign near the bullet hole, the power of prayer helped end that standoff. In those days, Dobson was known primarily as a folksy child psychologist, an avuncular figure with a popular radio show who used a heavy helping of Christian morality to flavor his advice on child-rearing. Today, prayer is only part of what Dobson is dispersing through radio,...