Stark continues to impress; he's like Jenkins without the weird (and often-irrelevant) anti-Mormon bias. The premise of this book is: that neither the growth of Christianity nor the Christianization of the Roman Empire required divine or imperial intervention. He uses the information which we possess to demonstrate that the growth of Christianity occurred quite naturally, did not require any mass public conversions, and that Emperor Constantine's Edict of Toleration and death-bed conversion were responses TO rather than causes OF the Christianization of the Empire. He approaches the available historical and textual evidence without trying to make it fit his a priori assumptions about antiquity, allowing the evidence to inform rather than forcing it to conform. This is (as always) refreshing.
The author offends some with his sympathetic depictions of early Christianity and Second Temple/pre-rabbinic Judaism, but his intent isn't to defend or to champion either religion. Likewise, he offends some by arguing that things other than the influence of God could lead to Christianity's rise, but balances it out by by reminding the reader that he is neither arguing for nor against any sort of supernaturalism. Ultimately his purpose is to uncover the social and cultural dynamics which led to the growth and expansion of Christianity in the ancient world, focusing on the ancient Roman Empire as a sort of religious marketplace and treating the various religions vying for supremacy as products and "firms" -- it's a healthy combination of history, economics and sociology.
Also notable is the fact that, while Stark seems generally sympathetic to Christianity (and Judaism), he is similarly sympathetic to the various specific paganisms he discusses. He never treats paganism as a single, monolithic entity, always addressing (albeit tangentially) the various religious traditions which make up the category we now refer to as "paganism".
And though Stark uses Mormons frequently as an example, he's doing so in full possession of the facts, and because it is directly relevant to the topic under discussion -- not because he has some barely-concealed ideological axe to grind for or against them. Stark is not a member of any of the various Mormon sects, but he has done extensive research into the growth of the main Church of Jesus Christ of Latter-Day Saints and the factors which contributed to that growth. He makes a convincing argument that the growth of "Mormonism" from less than a dozen adherents to several million (at the time of this book's initial printing) in the space of under 300 years is a plausible match for the growth patterns and methods of early Christianity.
He also takes 19th and then-contemporary 20th century academia to task for being more interested in disproving religion than actually trying to understand religion, religiosity or religious people. This is especially relevant today, as for my three separate academic Religious Studies degrees I was required to attend three separate seminar classes designed to "prove" that religion was hogwash. Using martyrdom as an example, Stark points out that the social and psychological explanations of religious activity and belief usually involve contemptuously writing religion off as the product of psychological illnesses and disorders; he then demonstrates how, from an economic perspective, the choices made by believers in religion (and specifically martyrs) are actually completely rational. The problem, he argues, is that we have come to conflate "rational" with "accurate" and "truthful" when there is rarely any correlation between them. Someone can make a perfectly rational choice without that choice needing to be grounded in anything demonstrably true. For instance, an ancient Roman urban citizen with a life expectancy of 30 years could expect to spend those thirty years suffering from all sorts of illnesses and deprivations and afflictions; most martyrs were already near or past their average life expectancy of 30, so it made perfect sense for them to choose death/torture over renouncing their beliefs because the former carried with it the possibility of an eternal life free from suffering in the presence of the Christian god while the latter carried with it the possibility of a few extra years of miserable mortal existence followed by an eternity of more-than-likely miserable immortal existence in one of the pagan afterlifes (which were not known for being pleasant to ordinary mortal spirits). The cost-benefit ratio was in their favor. Yet Stark also points out that whether that choice was rational or not depended on the individual perspectives of the persecuted; some of the persecuted chose NOT to be martyrs, and for them that was an equally rational choice. I'm not doing his argument justice as there is a lot more nuance and complexity to it, but suffice to say he capably demonstrates that modern anti-religious biases result in a view of history as distorted and occluded as any pro-religious bias.
He also confronts some of the problems scholars face due to their tendency to project their own moral and social views back onto ancient civilization. For instance, abortion and contraception are seen as "civilized" and "liberating" for modern women, and so modern scholars tend to assume that they have always been so; they assume that it was only because of prudishness, misogyny, or ignorant religious oppression that women in antiquity were denied these wonderful methods of "family planning." But the reality is that in antiquity the primary methods of abortion and contraception were wildly dangerous and dependent on the will of men. Men ordered women to undergo abortions, and the contraception methods often led to infection and poisoning for the women who used them. Both the methods for ancient abortion and the methods for ancient contraception also often resulted in female sterilization. Infanticide was also common, and usually done at the command of the father (or the husband, anyway). Infanticide and abortion were advocated by ancient philosophers and went largely unpunished by the ancient legal system; they were both used in the service of an ancient form of eugenics, and husbands often ordered their wives to abandon or murder infant girls because females were seen as less valuable. Marriage was largely regarded by Imperial men as a burden best avoided unless there was some financial or social status to be gained, and many a Roman historian and satirist mocked the fact that Roman men couldn't stand to be around their wives but loved to patronize female and male prostitutes. What is more, women in Rome were required by law to remarry within two years if they were widowed, whether they wanted to or not. Meanwhile the Empire was ravaged by a series of epidemic plagues, wars, fires, floods, earthquakes and famines. All this resulted in a society in which men overwhelmingly outnumbered women, and many of the remaining women died in childbirth or trying to prevent childbirth; thus the population of the Empire was actually shrinking by the time Christianity appeared, a fact well-documented by historians ancient and modern. The Imperial government tried to circumvent this by mandating marriage and requiring at least three children per couple, but the people ignored or resisted those laws; the government actually wound up importing Northern "barbarians" and allowing them to settle the regions of the Empire that had either been depopulated or were close to collapse.
Christianity (and Judaism) however prohibited abortion and infanticide, encouraged large families, argued that women and men were ultimately equal before God, ordered men to love and value their wives and daughters, and allowed widows to remain single (thereby maintaining control of their property in their families). Christian families were therefore larger than pagan families, and more Christian women lived to start their own families and stayed fertile longer. And while Christians were reproducing naturally, they were also engaged in the conversion of non-Christians. Stark notes that women were predictably the majority of primary Christian converts (ie: those who converted under their own auspices), and that men tended to be secondary converts (ie: those who converted because others pushed them to convert). This all resulted in the natural expansion of the Empire's Christian population even as the Empire's pagan populations contracted.
Stark also notes that Judaism naturally had many of the same qualities that allowed Christianity to survive, including prohibitions against abortion and infanticide (for which it was condemned by pagan writers), and attracted a fair number of converts throughout the Empire even as Jewish communities grew in the diaspora; however the religion also had stricter conversion requirements than did Christianity, resulting in the so-called "God-fearers", and even lifelong adherents often found themselves drifting towards or embracing Hellenism instead. Stark fails to note something else, but I think it bears consideration: had Judaism's conversion requirements and relationship to Hellenistic Imperial culture been a bit less complicated, had pagans been a bit less...well...lazy, or had Christianity just never come on the scene, Judaism could easily have become the Imperial religion. Jews had larger families, and Jewish women lived longer and stayed fertile longer; the addition of more converts in a shrinking pagan world could have pushed Judaism over the top! Now THAT is an alternate-history novel waiting to happen!
In any event, I highly recommend this book, especially in concert with Stark's "Cities of God". This is one of his earlier books, and you can see the genesis of "Cities of God" and "For the Glory of God" in some of the chapters.
UPDATE 1: Finally picked up a copy at the 2011 AAR/SBL conference in San Francisco. Looking forward to this one; Stark is fantastic at laying bare the actual history without letting personal political/social biases taint his understanding.