According to the evidence at our disposal, the expansion of the churches was not organized, the product of a mission program; it simply happened. Further, the growth was not carefully thought through. Early Christian leaders did not engage in debates between rival “mission strategies.” The Christians wrote a lot; according to classicist Robin Lane Fox, “most of the best Greek and Latin literature which remains [from the later second and third centuries] is Christian.” And what they wrote is surprising. The Christians wrote treatises on patience – three of them. But they did not write a single treatise on evangelism. 

What’s more, the early churches did not use their worship services to attract new people.