The author interrogates modern doctrines of species development and their relation to belief in a Creator, applying rules of rational belief and judicial reasoning to compare hypotheses of special creation and evolutionary development. He reviews the writings of prominent evolutionists, critiques the logical methods they employ, and cautions religious teachers about concessions that may undermine theistic belief, while stating he excludes scriptural authority from his argument. Part polemical critique and part philosophical inquiry, the work uses imagined interlocutors to test arguments and concludes that evolutionary explanations for the origins of body and mind rely on reasoning unfit for matters affecting human conduct and belief.