Is Darwinian evolution really the most successful scientific theory ever proposed--or even the best idea anyone has ever had, as Daniel Dennett once put it? The Mystery of Evolutionary Mechanisms provides a comprehensive critical reading of the literature of evolutionary biology from Darwin to Dobzhansky to Dawkins, revealing this popular account of evolution to be a grand narrative of Darwinian triumph that greatly overstates the empirical validity of modern evolutionary theory. The mechanisms driving the evolutionary process truly remain a mystery more than one hundred fifty years after Origin of Species, a fact that can free religion scholars to think in more creative ways about the positive contributions religious reflection might make to our understanding of life's origin and diversity. The Mystery of Evolutionary Mechanisms calls for an embrace of mystery, understood not as an abdication of the scientific quest for truth but as a courageous and humble acknowledgment of the limits of human reason and an openness to a fundamentally religious orientation toward life.