This books was published in 2007, at time before the great transformations that our world suffer. I think, though, that the main purpose of the text is shed light to traditions of Christianity nearer to a thoughtful and liberal viewpoint than to a dogmatic and conservative approach. The author is quite critical in his analysis of how Christianity has changed in its course of history.
As I am a Latin American, I appreciated the final chapter where is described the Theology of Liberation, an important way of think and practice the Christianity. Furthermore, the text is rather academically simple for reading, neither jargon nor linguistic puzzles.