Badfish, the thread is whether JC uttered the name Yahweh or whatever sound represented him at the time. As I said there is no record of what Jesus said because all we know about him was written a generation after he was supposed to have died and I repeat nobody wrote it down at the time and nobody remembers verbatim speech from forty or fifty years previously.
There are no historical records of Jesus only the unreliable Bible book of magic events recounts his life--and this is therefore not what historians would call "historical". Yet had he existed he would have made the headlines and been the focus of enormous interest. Had Josephus really known about him he would most certainly written expansively on this important matter since he was a Jewish historian writing for Romans and it was supposed to have taken place on his very doorstep. The comment he is supposed to have made about Jesus as the messiah is an uncharacteristically terse and a later 'Christian' insertion into his manuscript. Most people, possibly including historians want to believe in JC, however a majority believing in something does not make it true.
The mythicist view is not about mythologising a real living person after his death but about using a character in literature--like the myth of the god-man saviour-- then later claiming that he was a real person. Harry Potter lives!
This is what happened many times, the ancient story of a great healer, miracle worker who could raise the dead, the son of a god, was a character in folk tales and his tale was listened to by spellbound audiences at travelling theatre performances. The gospels manifest the language of a transcription of such a folk play.The character and life events of Jesus were known for millennia before Jesus of Nazareth. The attractiveness and leverage of the Graeco-Roman Jewish God man was to claim to the Roman world that he came to life and died a sacrificial death--just like all the preceding fictional saviours.
People will believe without good evidence if the idea gives them hope.