But he doesn't make such a blanket dismissal, it's a subtle difference but what he makes a blanket dismissal of is the so called historical evidence for a person called Jesus who started Christianity.
There is nothing outside the texts of those that believe in a god called Jesus that evidences that he ever existed,
A 'subtle difference', or simply selection bias?
I'm sure there are other historical figures for which we also have no direct evidence outside the writings of their followers. But just because other records may not have been written or did not survive, doesn't mean the people didn't exist. So what we have here is an
absence of evidence, not evidence of absence.
For most of us this would be enough. But not
dejudge. Why the desperate need to make a blanket dismissal in this case but not others? I sense a religious motive - a need to bolster one's unbelief against the mere possibility that the myth might have some small secular basis in fact, for fear that any chink in this armor could lead to a return of belief. Those of us who are comfortable in our atheism have no need for such strident denial.
if one thinks it is likely or 50/50 that Jesus existed
Let's ignore the name 'Jesus' for now, and consider:- how likely is it that Christianity started out as a small sect with a charismatic leader, as opposed to a group of people who got together and decided to invent one? History shows us that it is highly likely, while the alternative is rarer.
why not also hold the same view about the old testament god that the Christians claim is the same god as Jesus? After all there is just as much actual historical evidence that he was a real person.
It's not the same. The OT God was always a supernatural creator god, never a human.
According to the NT, Jesus was a
man who claimed to have a special relationship with God. Ignore the credulous reporting of his claims and 'supernatural' tricks, and it is easy to come out with the impression that he was just another cult leader who got up to similar shenanigans, eventually getting himself killed for it (his lieutenants then having to invent a resurrection and ascension to explain his absence).
Perhaps the biography of Jesus was created out of whole cloth to provide a suitable leader for a religion that didn't have one, but if so the writers did a pretty good job - even to the point of undermining their attempt to deify him (some passages make you wonder about Jesus's own confidence in being the 'chosen one'). One has to wonder why they needed to do this.
OTOH, if stories about an actual cult leader
already existed then they just had to exploit them. It stands to reason that if such a cult leader did exist then some of the stories probably had at least some basis in fact, and it might be possible to strip away the embellishments to reveal it.
It is simply that our cultures in what are or at least were originally "Christian" countries that make us prone to the idea that Jesus "probably" was a "real" person, it is a baked in assumption. Step beyond that presumption and you see he was no more likely to have been a real person than as I said Zeus, Apollo, Vishnu or Xemu.
I think it's more than that. Compare the Greek myths to the NT, and Jesus comes across as far more believable as a real person than Zeus or Apollo.
A better parallel might be
Robin Hood. Again, the name was quite popular (only for a robber rather than a savoir) and the established narrative (a mishmash and embellishments of earlier stories) is obvious fiction. Also,
There is at present little or no scholarly support for the view that tales of Robin Hood have stemmed from mythology or folklore, from fairies or other mythological origins, any such associations being regarded as later development. It was once a popular view, however. The "mythological theory" dates back at least to 1584, when Reginald Scot identified Robin Hood with the Germanic goblin "Hudgin" or Hodekin and associated him with Robin Goodfellow... While the outlaw often shows great skill in archery, swordplay and disguise, his feats are no more exaggerated than those of characters in other ballads, such as Kinmont Willie, which were based on historical events.
So here we have a case with no religious baggage, but which has attracted similar views. Note the objection to the myth theory - 'his feats are no more exaggerated...'. The general consensus is that the story of Robin Hood has its roots in a historical character whose existence cannot be independently verified. If Jesus was the leader of a cult that became Christianity,
his feats are no more exaggerated than those of other cult leaders. By this measure, both Robin Hood and Jesus could have been real people who have become the subject of myth.