In this slim well written volume Polkinghorne gives us a succinct comparison of the rational processes of inquiry required in both quantum physics and Chistian theology. As he says in his preface if you're looking for a book on quantum physics he has written a different work treating that subject specifically. He has also written elsewhere about his Christian faith and theology. This book's real value lies in its encouragement towards further reading.
Polkinghorne reaffirms his commitment to "critical realism" largely derived from Michael Polanyi. He then takes us on a fascinating journey of the intellectual history of quantum physics and theology. He draws a series of parallels in the two disciplines. Starting with a discussion of how science uses experience and understanding in the process of discovery he explains how the relationship between theory and experiment played a part in Einstein's development of the theory of relativity. That is paralleled by a discussion of how Christology is shaped by the historical record of Christ found in the Gospels. That supports his adoption of "bottom up" theology. This format is followed throughout the book - first discussing an aspect of the history of science and quantum physics followed with a history of some aspect of theology. Overall, this makes for some fascinating reading, if at times a little confusing as to exactly how these different histories are paralleled.
Some of the scientific subjects covered are: the development of relativity, quarks, atomic structure, waves and particles, quantum indeterminacy and quantum field theory. The theological subjects include Christology, the historical Jesus, the incarnation, the doctrine of two natures, doctrine of the Trinity, miracles and eschatology. Polkinghorne finishes up with a discussion of some human aspects of intellectual inquiry such as the role of genius, insight, imagination, thought experiments and how the choice of words influences conceptual formulation.
Polkinghorne's aim is to get scientists to appreciate the rational inquiry demanded of theological reflection and perhaps to do some reading in theology. Likewise, he encourages theologians to appreciate the intellectual rigor of scientific inquiry and to study science to see what that might add to their own theological formulations. I think this book succeeds in stimulating the reader in those directions.