Presumably what happened to Jesus was what happens to all of us when we die. We decompose. Accounts of Jesus's resurrection and ascension are about as well-documented as Jack and the Beanstalk.
Peter Sutcliffe, the Yorkshire Ripper, distinctly heard the voice of Jesus telling him to kill women, and he was locked up for life. George W. Bush says that God told him to invade Iraq (a pity God didn't vouchsafe him a revelation that there were no weapons of mass destruction).
Jesus was not content to derive his ethics from the scriptures of his upbringing. He explicitly departed from them. [...] Since a principal thesis of this chapter is that we do not, and should not, derive our morals from scripture, Jesus has to be honoured as a model for that very thesis.
It could be any of a billion Gods. It could be God of the Martians or of the inhabitants of Alpha Centauri. The chance of its being a particular God, Yahweh, the God of Jesus, is vanishingly small - at the least, the onus is on you to demonstrate why you think that's the case.
Matthew and Luke handle the problem differently, by deciding that Jesus must have been born in Bethlehem after all. But they get him there by different routes.
In other words Luke's story is historically impossible and internally inconsistent. He lied to fudge the fulfillment of Micah's prophesy and to provide a villain to play off Jesus in his fictitious drama. Matter flows from place to place and momentarily comes together to be you. Some people find that thought disturbing. I find the reality thrilling.