As to Judas Maccabeus etc. here we see the gradual start of messianism, in the Maccabean period, long after 600 BCE. Find a non-material Jesus being venerated by messianists, post 167 BCE and pre 30 CE, without ever having dwelt on Earth and, as I say, you will have made your case.
There were any number of mythical gods introduced into the religious beliefs of that region by the Greeks from at least 300BC, and then with the Romans from around 30BC. Like Jesus, several of these were also dying and rising gods. Those gods all had names. But none of them were real … though people at the time were certain they
were real.
The
"case" is made by the simple fact that if you read Helms, he describes where all the gospels stories of Jesus came from in OT writing. The Jesus of those stories was certainly mythical, because the stories were already in the OT many centuries before Paul‘s vision of a supernatural risen messiah (get a copy of Helms book, and you can read it for yourself).
All throughout history, since many thousands of years BC, and all the way through right up to the present day, religious fanatics in all religions and in all parts of the world, have believed in countless imaginary mythical gods, angels, devils, demons & spirits etc. So it would hardly be a surprise if Jesus was any different from all the thousands of others, especially since nobody who ever wrote about him had ever seen him, heard him or otherwise met him, and all thought that he must have died at some time in their past. The anonymous biblical writers and copyists who wrote about him were also probably Christians’ fanatical in their religious belief, & hardly a neutral reliable source on the matter of their religious beliefs in the supernatural.
The Dead Sea Scrolls which long predated Jesus, but which continued to be written all through the time of Jesus and Paul, ie from c.200BC through to about 70AD, also describe a previously unknown figure who they called their Teacher of Righteousness, who may or may not ever have been a real living high priest of the time, or who may have been a real priestly leader from centuries before, or who may have only ever have been just a mythical figure drawn from their practice of creating reality out of their religious dreams based yet again on their faithful certainty in the inerrancy of OT writing about the messiah who would definitely save the Jewish nation ... just like Paul seems to have been doing by c.35AD.
So there are plenty of earlier precedents for someone like Paul claiming to see a vision of a supernatural messiah sent from God and fulfilling the OT. In this case, a supernatural messiah who had in any case been prophesised and believed by devout Jews in that precise region as a god-given certainty from at least 500 years before Jesus.
And against that, you want to say what? That you just can't understand how Paul or later gospel writers could have come to think a messianic god figure had once existed, according to OT scripture, and done all the things in OT scripture? You are just incredulous about that?