This foundational book places the child at the center. It is based on a longitudinal case study of the religious development of young children. Readers gain insight into the religious thinking and behavior of preschool children. It becomes clear that all children - including those who grow up without a specific faith - develop an individual sense of spirituality. This raises questions about the religious education competencies and professionalism of educational professionals. The foundational book outlines the knowledge and skills they need to support and promote young children's religious development. A lexical section provides simple and concise explanations of religious and theological terms relevant to religious education work.