If the average non Christian consumer were to begin considering conversion, spending less than an hour perusing a Christian book section or facing the lists of churches in the Yellow Pages would be enough to confuse them to the point of reconsidering. Christians come in all shapes, sizes, and variants. Although Paul encouraged unity in the Body of Christ, it has never been achieved. What we all agree on is a short list.
Despite that, there are some essentials that belong in every church, whether Baptist, Catholic, Pentecostal, or non Demoninational. John Stott has taken the vital facts that you must believe to be called Christian and placed them in a straightforward easy to read book. With a precision akin to Lee Strobel's Case for Christ, he lines out the ABC's of faith. The logic of the Resurrection to the deeper meanings in the Ten Commandments are laid out concisely.
*** Long time believers may not have any "aha" moments, but if they read this, they will have more to defend their faith than "it's true because it is written and I believe it." New believers or seekers will know what is most basic without the rigamorole variations that difer from sect to sect. ***