Did Jesus exist at all?

[Aractus]

Not this again.  Yes, it is how mythology works.  Many times, over and over, collectively, we arrive at narratives not -at all- like news reports.  Some stories persist, many or even most do not.  Those surviving narratives are what we, say a thousand or so years later, might call a mythology (or more generously, in context - and incredibly on point, as the other representative genre of literature which the story -might- be able to qualify as; a collection of legends).  

The details and the plot do not simply manifested themselves upon thought, word, or page.

No but they do get written down. They've been written down in Ancient Egypt, in Rome, in plenty of other ancient places. There are currently millions - not hundreds, not thousands, not tens of thousands - millions of individual Hindu deities with their own individual mythologies. Some of those would be written down as well and held by just single families. My point is that the Pentateuch is a clear-cut example of mythology, you'd be hard-pressed to find a better one. It also formed the basis of a religion, and that's what makes this specific mythology so interesting. Many of the concepts and beliefs written down in the Pentateuch and attributed to the Patriarchs have been directly associated with other beliefs in the region which were held from the 2nd millennia BC. So they didn't "just appear" on the pages of the Pentateuch - that's wrong. They appear several centuries beforehand in several different pre-existing cultures, which later assimilated their beliefs into what would have been the original version of the Pentateuch. The version we have now is greatly expanded upon using direct Judaic mythology - i.e. it's a feedback loop that fed into itself. I've pointed this out several times - nothing "just appears" from nowhere in the Pentateuch, much of it can and has been tracked. This doesn't mean that other books don't have a clear political agenda, just that the Pentateuch is not the production of vested interests and fiction writers.