Whatever anyone thinks of "Religion and Science," it is clearly a definitive if not the definitive work on this subject because the book's references and discussion of them are extremely comprehensive, almost to the point of being mind-numbing!
I feel that the author does a far better job of explaining science and scientific methodologies than religion and its methodologies, though I do find it useful to consider religion and religious experiences in terms of normally scientific terms, which he defines as agreement with data, coherence, scope, and fertility.
I really enjoyed Chapter 7, entitled "Physics and Metaphysics." Mr. Barbour gives a very good presentation of the basic concepts of twentieth century physics, such as quantum theory, relativity, and chaos theory, and also presents some thought-provoking ideas about how modern physics can and cannot be related to religion, especially Eastern religions and mysticism. Barbour, with some validity, takes on books such as "The Tao of Physics," and criticizes what he feels is overstressing the similarities between physics and mysticism. Again, there are many references provided that are well worth further study.
As I stated above, I found the discussion of religion less appealing, precisely because it is far too intellectual, and is limited to what I will call "human-only" theses, and there are so many models and points of view presented I found it impossible to keep them straight. The author does state repeatedly that religion is "interpretive experience," yet he seems to feel that hundreds of intellectual explanations and theories of religion and God are what is called for to be "coherent;" however, the effect to me what was basically the opposite.
The explanation of Whitehead's main theses is good in developing what the author calls "process theology." Yet I am sorry to say that I got the impression that the author, who uses the word God over and over, has himself little experience of God other than what he has read from philosophers and the Old and New Testaments, i.e., intellectual only. He barely mentions reincarnation and karma, and clearly doesn't accept them. To me they are vital concepts in understanding the way "God" is, or I would say the laws of the "Universe," and certainly in trying to understand what the relationship of our souls is to the temporary, material existence. There is virtually no discussion of death in this book other than vague references to Christian doctrine, from what I remember, and to me a thorough discussion is absolutely crucial in any book about comparative religion.
The author himself admits that models don't represent literal (physical) reality, and I would add that they also do not represent spiritual reality, and thus are overrepresented here in the latter context.
Mr. Barbour also supports, among many suggested models, modes of interaction as well as dealing with the obvious differences in scope between the two disciplines, with which I agree. He maintains that the two disciplines in principle occupy difference realms of knowledege, really experience, and thus he supports the "Independence" model, in order to avoid the kind of confusion that arises when religious leaders try to defend their beliefs with the latest findings in science. As for interaction, Barbour supports the "Dialogue" model, not only between religion and science, but among different religions, eschewing any claim of exclusive truth by any group.
My criticisms of this book are perhaps harsh given its amazing scope. I do recommend it as a valuable resource. The author takes on the almost mpossible task of presenting religion and science and their relationship very credibly, perhaps better than any other author.