Primitive Christianity examines the historical and theological roots of the Christian faith, tracing its development from the teachings of Jesus through the early apostolic communities. Grounded in critical scholarship and historical context, the work explores the spiritual, cultural, and philosophical forces that shaped Christianity's emergence in the ancient world. Otto Pfleiderer analyzes the influence of Jewish tradition, Greco-Roman thought, and internal doctrinal debates in forming the foundations of Christian belief. He gives special attention to the contrasting roles of Jesus, Paul, and the early Church in creating a movement that evolved from radical reform to structured religion. Balancing historical detail with theological insight, the book offers a foundational analysis of Christianity's origins that continues to inform academic study and interfaith understanding today.