I like this book because it is a short presentation of two clashing viewpoints. It is a very good place to start for anyone who is reaching for what is true. There are plenty of books out there which are one viewpoint or the other. Since the book is brief, and the positions sincerely presented, I give it five stars.
Douglas Wilson is committed to an approach in apologetics known as presuppositionalism. Rather than debate individual points of evidence, he would seek to look at what his opponent is presupposing in order to come to his conclusions. Wilson thinks that Hitchens, as an atheist, has no ground of certitude for making any moral claims, or any claims of knowledge. Wilson would argue that an atheist is borrowing the presuppositions of Christianity in order to make his or her point.
Hitchens argues more directly, challenging Wilson by the use of evidence. For example, science has shown that humans have evolved. Therefore, humans have been around for at least 100,000 years. For most of those years, humankind suffered tremendously while God did nothing to alleviate that suffering. Hitchens is very fond of Ockham's razor as a way to explain things. Why not look at the most immediate and plausible explanation as to why things happen? Don't invent fanciful supernatural explanations, which are no explanations at all. Similarly, don't invent fanciful theological/philosophical systems like presuppositionalism, which it can be argued is a concession that Christianity can't meet the challenge of evidence. Rather than argue the issue on the basis of evidence, the presuppositionalist insists on presupposing the supernatural religious motifs of scripture, namely, the self-sufficient God, the creation of the universe, the fall of humankind, etc. Again, Hitchens would argue, these are religious assertions, not evidence.
In conclusion, this is a nice short introduction to the debate between atheism and theism.