I have a lot of thoughts about this book so I apologize in advance.
It was a very balanced, thorough and informative work about the history and theology behind the Great Schism. Though the author is Orthodox, he does a fantastic job of showing how both sides have contributed to the continued division. He presents the various arguments in their strongest forms and cites Scripture, the patristics, and respected scholars from a variety of religious backgrounds. He also does a tremendous job pointing to further reading that is scholarly while also avoiding the various “pop apologetics” books that are common to both sides of the aisle.
But I think the best- and most challenging- part about this book is the author’s blunt honesty. He makes it no secret that both Churches have massive problems and flaws that not only inhibit the process of unification, but also raise questions about the validity of some of their own distinct theological claims.
A recurring pattern was that arguments used by one side on a specific issue could be easily used against them in turn. Take the issue of purgatory and apparitions. Orthodox deride these aspects of Roman theology as made up inventions that can only be derived from the wrath of an angry western God in the words of one Eastern Orthodox theologian. Yet the Orthodox have many prayers offered for the dead that are considered effective. And why is this? Because of Orthodox apparitions that claimed this was the case. So in other words, when the Catholics do it, its demonic and unbiblical, but when the East does it, it's the will of the most Holy Theotokos herself. Makes sense!
Or the issue of contraception. Catholics often accuse the Orthodox of caving in on this issue with many Protestant groups (more on them later). Yet not only do many Catholics today actively practice contraception, but the concept of NFP was feared by many Catholic theologians at the time of its introduction to be a potentially harmful influence that would lead to a lessening of restrictions on other forms of contraception. Both churches want to follow “the Consensus of the Fathers”, but as the author rightly points out, many of them had a low view of marriage entirely, and believed sex in marriage should only be for procreation and that married Christians had almost second class status theologically.
Or the Immaculate Conception. Many Orthodox hold this view to some extent, and one can find evidence that various church fathers, both east and west, held to some version of the dogma as well. But is there enough evidence from scripture and the early church that justifies Rome making it a binding dogma that if one doesn’t hold to, they are out of communion with the Church and thus their salvation is at risk?
All of this ties back to a major theme of the book; both the Orthodox and Catholic Churches have incredibly exclusivist ecclesiology and claim to the be the one true Church, and all others outside of their communions are at risk of being lost. This of course means that each of them are trying to prove that they are a continuation from the vision of the apostles and the church fathers. But as the author admits, both churches have fallen far from carrying this task out, and it has led to troubling consequences.
This is especially the case with Roman Catholicism and the doctrine of papal infallibility. Though officially only used twice, there is debate as to what exactly constitutes an “ex cathedra” statement, as one prominent defender of Vatican 1 cited in the book claimed that “thousands and thousands” of previous statements could be considered infallible. This is troubling as not only could ethically troubling statements be considered infallible (such as the bull against Luther which justified burning heretics) but its lack of clarity is itself a problem. The claims of the papacy are so grand and so immense that everything in the Roman system hinges upon them being correct. If the doctrine of papal infallibility falls, the Roman Church falls with it.
Ironically, the group that wins with this book- and also the one that the book does the most disservice to- are the Protestants. The author seems to believe throughout that the only Protestants around are evangelicals who just need to read some church history and then they’ll convert. This completely ignores confessional Presbyterians and Lutherans who certainly will be familiar with the writings of the early church, as well as confessional Anglicans, who could make a case for apostolic succession. In fact, the translator of a popular set of early church father writings is himself a Protestant. With the information presented in this book, I could easily see an inquiring Protestant taking the position of Anglican apologist River Devereux: “There is too much good, too much right, and too much inspired, in both the Church of Rome, and the Church of the Orthodox, to say in any good conscience that only one of them be the Shepherd’s Flock. Moreover, in Rome there is too much inconsistency, too much wrong, and too much earthly; in the East, too much disunity, too much incorrectness and too much irrelevance, to say the same.” Though I disagree with this view, it’s not an unreasonable one to hold. If the author’s goal was to bring about Christian unity, he will need to do better.
This book is far from an easy read, but I cannot recommend it enough if you wish to learn what the other side thinks and how to better engage in dialogue on these various matters.