Thanks for bringing the Symmachus quote, Manetho. I like it. I'm not sure the context of it, so I'm wondering what is meant in some cases.
That is an important point because, in order for the mythicist scenario to be plausible, they have to explain why the story-inventors went through all the trouble to compile and include accurate information for the first century context, especially when that information would have been out of context in the second century and in some cases quite inaccessible. Their scenario implies that whoever made up these stories was trying to meet a a modern threshold of probability.
This is as much an argument against mythicism it seems as it is against a mythologized historicity position. That is if Jesus' story was mythologized at all, then, apparently, someone has to explain why the story-inventors/exaggerators "went through all the trouble to compile and include accurate information for the first century context". I'm not following his "especially when that information would have been out of context in the second century..." since neither side takes the gospels as if they were written in the second century. I have no idea why a god who was supposedly said to be a man, and had stories made up about him, would expected to be any more accurate than a story about a god who was never a man but was made into one in the story told about him.
It is very curious that these elements (and others) are so little represented in the gospels, then, but on the other hand the amount of accurate detail in the gospels is astonishing for an invented text: about how the Roman government worked in Palestine in first century (which was radically different from how it worked in the second century!), the sheer existence of the synoptic problem, the nuances of the Jewish communities in the first century that didn't exist in the second—one could go on, but the basic point must be grasped that the amount and level of detail in the gospels would mean, if Carrier is right, there must have been at least one researcher (probably more) with a curiously anachronistic post-enlightenment sense of historiography who was endowed with philological skills unparalleled in antiquity. The closest match I can think is someone like Jerome, but even he lacks the kind of modern methodological rigor that this would require, not to mention a devotion to accuracy that most ancient historians didn't even have, let alone somebody of less than elite education.
Again I am curious why he thinks the mythicism position would suggest the gospels were written in the second century. I don't know whose saying that. It seems to me, anyone who thinks that Jesus' story was mythologized is convicted on Symmachus' take. He seems to be saying that mythologized accounts of gods would normally lack the type of detail and knowledge of that which we get from the gospels. I mean, that'd be odd, but apparently I'm missing some context.
“Every one of us is, in the cosmic perspective, precious. If a human disagrees with you, let him live. In a hundred billion galaxies, you will not find another.”
― Carl Sagan, Cosmos