What do Christians believe and why? In this enlightening volume, Douglas A. Sweeney takes you on an accessible journey through the history of Christian doctrine. Moving beyond abstract theory, this book explores the substance of our shared faith, tracing how core teachings developed through the centuries to address the challenges of their time. By examining the lives and writings of key thinkers, you will gain a clearer perspective on the major theological milestones that define the Church today. Whether you are a student, a lay leader, or simply curious about the roots of your beliefs, this book provides the necessary historical context to understand what it means to be a follower of Christ. You will find clarity for your own spiritual journey, learning how the insights of the past continue to provide a firm footing for our faith in the modern world. It is an essential resource for anyone looking to connect their daily walk with the rich intellectual heritage of the Christian tradition.