. . . But the larger complaint I had about the programme was his repeated references to early Christianity as a secretive or covert movement that resorted to supposedly cryptic symbols to avoid detection. In fact, everything we know about pre-Constantinian Christianity indicates a movement seeking to make itself as known as possible. I mean, when you have Christian figures such as Justin Martyr writing formal/extended defences of Christianity addressed to the Emperor (Justin’s Apology), how secretive are you trying to be??
From Larry Hurtado’s blog, November 28, 2012.