The bottom line: On Who is God is a theologically sound and powerful treatise on God’s identity as well as a defense of the Trinitarian God of the Bible.
If you seek a quick, succinct, clear and easy-to-read guide to better understand the central tenets about God, then look no further. Certainly, you could read a more comprehensive theology textbook, but you then would have to make it through hundreds of pages in order to extract the same basic themes. Without question, On Who is God never strays away from the Biblical text.
In the introduction, author Mark Driscoll draws the analogy that the book is a defense of the God of the Bible in the midst of a pagan society with many other deities—so, like the apostle Paul’s speech before the Areopagus to the unbelieving Athenians thousands of years ago, this book is read as a philosophical, rational, intellectual, and theological weapon to be used by believers in defense of God in the contemporary world. At the same time, On Who is God provides convincing arguments for Trinitarianism for those who are curious or on the fence.
The book is divided into five chapters. The first two chapters “Knowledge about God” and “Perspectives about God” do not deal with God per se but respectively describe the arguments in favor of God’s existence and the different models of theism (e.g. Atheism, Pantheism, Monotheism, and Trinitarianism). The last three chapters dig deeper into answering, “Who is God?” by describing God’s characteristics (“Nature of God”), the deity of Christ (“The Incarnation of God”), and ways to glorify God (“Worship of God”).
For me, what separates this book from the rest is that it starts by contemplating the question, “Does God exist?” and then proceeds down a track of philosophy, reason, logic and Biblical revelation to conclude that yes, He does exist, and then explore the limitations of other theistic ideologies in order to arrive at a single truth. The different arguments in favor of God’s existence (e.g. ontological, teleological, cosmological) and discussion of other faiths may be too “intellectual” for some readers, but in order to know what the truth is, one ought to also know what’s false or only partially true.
Finally, the references for further study at the end of the book in the appendices are numerous and very well chosen. On Who Is God will certainly be a great first step for faith seeking understanding, Bible study groups, and eager students. In short, very big truth in less than 100 pages. (And you probably will not get through it in an hour, as the book claims you can).
Dr. C. H. E. Sadaphal