On very rare occasions, pagan opponents of Christianity during the first three centuries commented on the movement, and in one case at least, explain why it was having some success in converting people. Here is what I say about it in Triumph of Christianity (Simon & Schuster, 2018), lightly edited here.
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The first extensive discussion of the Christian movement from a non-Christian source (not disinterested, of course!) comes from the end of the 170s. We do not have this source as a stand-alone document. It is a book quoted, instead, by a Christian author, the great theologian Origen of Alexandria, who cited it precisely in order to refute it. The book had been written by an otherwise unknown pagan intellectual named

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