The premise is promising. I'm all for "revisionist history" where it can shed light on the parts of history that have been shoved into a corner and neglected, which is exactly what this book sets out to do.
While some have (rightly) accused European history of being "Westocentric," Jones and Ereira reveal that a more accurate charge would be "Romacentric". Indeed, they say, we have been sold the idea of Rome as the epitome of civilization, the zenith of the Classical world, while the so-called Barbarians were ruthless savages bent on destruction for destruction's sake.
It's certainly easy to see how this European myth has had repercussions through the rest of our history, which makes books such as this all the more important. It certainly helps that the writing style is fun, intelligent, and witty.
As you get into the work, you do get the niggling suspicion that they tend to overstate their case. This is somewhat forgivable, as they acknowledge right in the introduction that they are portraying the Romans as the "real Barbarians" and, besides, turnabout is fair play, after all.
It is unfortunate for the authors, however, that one cannot write a complete history of Rome (or of "Rome") without coming to the topic of Christianity, and it was here that the authors totally lost me. While the particulars of Ancient Christian history are quite complex, all-too-often tied up with the politics of the Empire (post-Constantine, of course), I would expect such a seemingly well-researched book to at least get some things right on this topic.
Not only do they repeat the ignorant twaddle that Constantine infused Sun worship into the Church, moved the day of worship to Sunday, and moved the celebration of the Nativity of Christ to December 25, i.e., the feast of Sol Invictus, they go so far as to assert that Arianism was the "old fashioned" form of Christianity, and that Trinitarianism was some new-fangled, irrational dogma devised by the "Catholics" (by which, they apparently mean, the Roman Catholic Church), which was resisted by the East until it was imposed on them thanks to the efforts of St. Ambrose of Milan. In doing so, not only do they oversimplify the Arian controversy to an extreme, they also completely ignore the efforts of all the Greek and Alexandrian Church Fathers, from St. Athanasius the Great to the Cappadocians, Sts. Gregory of Nyssa, St. Basil the Great, and St. Gregory of Nazianzus.
In addition, when they do speak of the Arian Vandals "invading" Roman Carthage, they acknowledge the Vandals did destroy some theaters and arenas, but defend this destruction by saying, "but this was because [the purposes of the buildings] were immoral." One doesn't get the sense that "Catholics," whether because they were Catholic or because they were Roman, committing similar acts would have been viewed so graciously.
Later on, they speak of St. Augustine of Hippo's teachings as if they were fully accepted by the entire Church (Augustine being practically unknown in the East), and these are just a sampling of their errors. In the end, their view of Christian history is still hobbled by they same "Romacentrism" they spend most of the book railing against.
While this is, admittedly, a pet peeve of mine, I also do not deny that Christian history has been as rosy as we would like to believe. Certainly, our brethren throughout history, even up to today, have all-too-often failed to live up to the teachings of Christ, and I am all for owning up to these failings. There are plenty to pick from without engaging in misrepresentation of events our repeating of falsehoods.
The larger issue for me is that these blatant errors seriously undermine the arguments put forward in the rest of the book. To refer to an event that is recounted near the end of the text, these errors are like the earthquake knocking a hole in the impenetrable walls of Constantinople. The Huns didn't need it to be a big hole...just large enough to let a few men through at a time to overrun the whole city. Unfortunately for the authors, they did not have time to rebuild the walls before the Huns showed up.