The good thing about the book is that Carrier acknowledges openly that the same methodology he employs to defend mythicism (Bayesianism) could very well give the opposite result*The bad thing is that he is not yet prepared to accept that Bayesianism may just not be applicable in the case of Jesus studies where "probabilities are small, data is low quality, possible reference classes abound, and statements are vague".
Finally it's not a rocket science to see that if one agrees that Paul talks about an earthly Jesus and that there is a weak connection with other mythical heroes (it's common sense I'd say, no need of tortuous, ad hoc, auxiliary hypotheses to explain away) then Bayesianism gives the obvious conclusion that Jesus actually existed. But then people arrive at opposite conclusions based on the same set of data, no improvement over the criterions of authenticity. Either Bayesianism cannot make a difference or if it does then one of the approaches is wrong.
Let me believe that if the latter is the case then Carrier is on the 'wrong branch' (given the numerous 'epicycles' one needs to add to explain away some crucial direct evidence for an earthly Jesus). Overall I really doubt he can tilt the balance toward mythicism in secular Academia (completely unpersuasive for me his lectures, see youtube).
I read over those numerous 'epicycles' and using the John Frum cargo cult as a baseline I find some fo them wanting.
(1) Evidence of other Christians with different conceptions of Jesus.
Guiart, Jean (1952) "John Frum Movement in Tanna" Oceania Vol 22 No 3 pg 165-177 goes over the early history of the John Frum and we see a similar variance of conceptions of John Frum so this arguments dies.
(2) How did a heavenly Jesus acquire this title of Christos?
One of the strange things about Acts is in all copies we have until c 450 (Codex Alexandrinus) used the term Chrestians but use Christos to describe Jesus himself. But if the former is derived from the later how do they spell it right with the title but not with the derivative?
In fact, early Christian authorities like Tertullian went to great pains in explaining that Christian and Chrestian were two different words with entirely different meanings and were not variants of each other. But this begs the question of why does Acts itself use Chrestian until c450?
One variant of the Tacitus letter bouncing around the internet used by Pro historical Jesus people is "This was the sect known as Christians. Their founder, one Chrestus, had been put to death by the procurator, Pontius Pilate in the reign of Tiberius." and we know that the oldest copy was tampered with--Christians was originally Chrestians.
In PGM IV. 3007-86 we read about "Jesus Chrestos, the Holy Spirit, the Son of the Father" Twelftree in his In the Name of Jesus: Exorcism Among Early Christians states "Although it is generally agreed that this papyrus dates from the fourth century CE, its contents are more likely to come from the second century CE."
So was Paul's Jesus actual title Chrestos (a very common title going back to 5th century BCE) and latter copyists "fixed" the error making it Christos?
(3) James is attested as brother of Jesus in other sources apart from Gal. 1:18–19
In a variant of the John Frum cult c1957 John Frum acquired Prince Philip, Duke of Edinburgh as a brother...even though he only has sisters. NEXT.
(4) The imminent apocalypticism of Paul
This doesn't mean anything. The Gospels which most scholars put 70-100 talk about an "imminent" apocalypse. Heck today some 2000 years after Jesus was supposedly crucified you get people claiming THE END OF THE WORLD IS NIGH, REPENT. Rendering this a nonsensical argument.
(5) 1 Corinthians 2:8: Jesus killed by “rulers of this age”
And what prey tell is meant "this age"? The age of the Roman Empire? The age of crazy Emperors like Nero (ie no earlier then 54 CE)? Paul never specifies what time frame is "this age". So another non argument.
(6) A crucial passage is Philippians 2.6–8
John Frum being a brother of Prince Philip, Duke of Edinburgh must have been born...sheesh. NEXT.
As the above shows the "arguments" are rubbish.
then
then
then finally