The traditional way of doing theology among evangelicals---setting forth a rigid theological system and then vigorously defending it as revealed truth---has tended to emphasize points of disagreement among Christians rather than the beliefs we all hold in common. This book is a welcome departure. What Christians Believe offers a general theology that will serve all groups of evangelical Christians. It focuses on the unity of the various confessions while affirming diversity in matters of secondary importance. What Christians Believe takes the approach of contextualized theology---that is, it recognizes that all theological systems reflect the cultural grid in which they developed. Therefore, this book takes a two-pronged approach to each concept it covers. Alan F. Johnson discusses its biblical foundation, and Robert E. Webber traces its historical development in the church.
Given most of the dross that is out there by way of single volume historical theology texts, this is actually not a bad volume. Super basic yes, but still, I would choose this an day over McGrath... again, not because it is super informative or groundbreaking. It is concise (perhaps to a fault) but in the end, you will walk away with more profitable retention of the history of dogmatics than you would with many other volumes in this vein. Content is mainstream evangelical.