Children’s ministry leaders who evaluate which curriculum to use for their Sunday school quickly discern vast differences in curriculum design philosophy. In spite of calls for integration, the debate between content-centered and learner-centered children’s Sunday school curricula has not been settled. This article examines a foundational doctrine of the Reformation, the doctrine of Sola Scriptura, in order to apply it to the design and evaluation of children’s Sunday school curricula. After briefly describing the meaning of Sola Scriptura, the article details the implications of Sola Scriptura for children’s Sunday school curriculum design. It then offers an evaluative grid for children’s ministry leaders to use when evaluating curriculum.