I’ve been discussing just how quickly early Christianity appears to have grown in the earlier centuries.  Now the rubber hits the road.  In this excerpt from my book Triumph of Christianity (Simon & Schuster, 2018)I explain both what the rate of growth must have been and even more interesting — the main point for me, really — is how many Christians there were in the world at various points of time.  I for one found and find the answers a bit surprising.

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Thus it appears that the beginning of the Christian movement saw a veritable avalanche of conversions.[3]  Possibly many of these are the direct result of the missionary activities of Paul.  But there may have been other missionaries like him who were also successful.   So let’s simply pick a sensible rate of growth, and say that for the first forty years, up to the time when Paul wrote his last surviving letter, the church grew at a rate of 300% per decade.   If the religion started with twenty people in 30 CE, that would mean there were some 1280 by the year 60.   That is not at all implausible as a guess, but it is way too precise – so let’s just say 1000-1500 Christians.  But growth cannot continue at that rate.  If it did, a century later, in the year 160, there would be well over a billion Christians in the world.

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