This book, as the title would suggest, is a challenge, for a couple of reasons. First it is a challenge because Wright's intense historical analysis leads him to say some unexpected things about Jesus and early Christianity, casting doubt on the traditional understandings of certain passages in the bible, and on some aspects of how the church understands Jesus. Wright, for his part, insists that what he is doing is worth it, and I am inclined to agree on that point. You may not agree with all of his conclusions, but once you realize that Wright is a sincere believer and is not actually in any way threatening basic orthodox Christian belief, the worries will go away (at least that was my experience).
In terms of the historical information presented, Wright lays out, in terms that the average person can understand, the basic conclusions (and the arguments for them) that he has come to in his historical work on Jesus and early Christianity. What is most appealing to me about this is the great sense of historical narrative that Wright has--the theme of God redeeming the world through Israel, and how Jesus understood himself as fulfilling that vocation in his own life and person, and eventually, through his suffering and death on the cross. The overall picture Wright paints gives the reader a good sense of how well Christ fits into the overarching narrative of scripture, and beyond. The book contains a good summary of Wright's brilliant historical defense of the truth of the resurrection.
The last two chapters are the second reason that the book is a challenge: a challenge to the church and to each of us to live the message of Jesus. They are beautiful, and make the entire book worthwhile. Wright gives his vision of where the narrative of God's work in the world is at today, and what Christians are called to be in the current world, which he characterizes as post-modern. Basically he says that what Jesus was for Israel, the church is to be for the world. He envisions the church bringing hope to a world that has just experienced the failure of a false narrative (modernity's humanistic vision of salvation through rationality, individuality, and technology), by living out and demonstrating in many ways the reality true narrative, which is the work of God's redeeming love through Christ, the defeat of evil and the forgiveness, hope, healing, new life, and fulfillment of our ultimate purpose that is available to us through him:
"The radical hermeneutic of suspicion that characterizes all of post-modernity is essentially nihilistic, denying the very possibility of creative or healing love. In the cross and resurrection of Jesus we find the answer: the God who made the world is revealed in terms of a self-giving love that no hermeneutic of suspicion can ever touch, in a Self that found itself by giving itself away, in a Story that was never manipulative but always healing and recreating, and in a Reality that can truly be known, indeed to know which is to discover a new dimension of knowledge, the dimension of loving and being loved."