A. The statistics are hard to come by, because we lack adequate sources for firm numbers.
B. Clearly, Christianity started off simply as a small band of lower-class peasants in Jerusalem, possibly 20 to 100 people, who had been followers of Jesus during his life and continued to believe in him after his death.
C. It is difficult to know how many people this small band of followers converted in the early years, but we do know that small Christian communities were started throughout the entire Mediterranean over the decades that followed.
D. Over the course of 300 years, the religion had grown to be about five percent of the population of the empire, or some three million adherents.
E. That rate of growth does not require massive conversions but simply a steady stream of converts. It represents a growth of about 40 percent every 10 years...
F. This growth was not achieved by massive evangelistic campaigns but by social networking, as one person who converted would then convert his spouse and (some of his) children, neighbors, and friends; over time, each of the converts would do the same.
G. The enormous change came with the conversion of Emperor Constantine in the early fourth century. Then, the church took off by leaps and bounds so that by the end of the century, fully half of the empire called itself Christian.
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Religions do have an epidemiology aspect, and early Christianity's message of personal redemption and eternal salvation made it a rather "sticky" propagative monotheistic uber-philosophy, superior to competing, non-universal folk religions of the day.
Mindshare is a zero-sum thing, and once there's a religion in monopoly position it's impossible to displace it.
posted by @troy at 12:46 PM on June 24 [2 favorites]