Hi M*W,
I know of the Carotta book but I haven't read it. I've almost bought it a few times but have not wanted to spend the $30 for something I already know. Also, Carotta and his supporters are very rude on the internet and dismissive of the CM thesis. They certainly haven't endeared themselves to me. Atwill is always very kind about it and says sure the writers of the Gospels borrowed freely from the life of Julius Caesar as it suited them.
Seems to me that somebody may have borrowed episodes of somebody's life is interesting but not the heart of the issue. What we really want to know is who wrote the gospels and why. Is Carotta saying that the administrators of the cult of Julius Caesar wrote the canonical gospels? Does that make any sense chronologically? I haven't thought about it much but I don't think it would. Unless the Julius Caesar cult was still being maintained in the time of Vespasian and Titus, or if the Flavians took something they had written 100 years earlier and totally subverted it for their own purposes. Anyhow what matters is that the gospels as we have them clearly commemorate Titus' Judean military campaign and Josephus (the official historian of the Flavian court, after all) tells us plainly so. Also, Jesus prophecies in precise in correct detail when and how Jeruselum will fall to Titus and Vespasian (the Father). Even if this is a later addition to the gospel (which I don't believe it was) it would still be profoundly important because it says somebody deliberately equated Jesus and God the Father with Titus and Vespasian.