John Calvin's 16th century reply to medieval Catholicism's buy-your-way-out-of-purgatory excesses is Evangelicalism's latest success story, complete with an utterly sovereign and micromanaging deity, sinful and puny humanity, and the combination's logical consequence, predestination: the belief that before time's dawn, God decided whom he would save (or not), unaffected by any subsequent human action or decision. Calvinism, cousin to the Reformation's other pillar, Lutheranism, is a bit less dour than its critics claim: it offers a rock-steady deity who orchestrates absolutely everything, including illness (or home foreclosure!), by a logic we may not understand but don't have to second-guess. Our satisfaction...