Myth 1 - The idea that Jesus was a myth is ridiculous
Myth 2 - Jesus was wildly famous - but ...
Myth 3 - Ancient Historian Josephus wrote about Jesus
Myth 4 - Eye-witnesses wrote the Gospels
Myth 5 - The Gospels give a consistent picture of Jesus
Myth 6 - History confirms the Gospels
Myth 7 - Archeology confirms the Gospels
Myth 8 - Paul and the epistles corroborate the Gospels
Myth 9 - Christianity began with Jesus and his apostles
Myth 10 - Christianity was totally new and different
I don't see how these show that Jesus was a mythical figure. Certainly it may show that for example there's a lot of things that aren't true within the Gospels. There is no reason to think that some guy named Jesus cast out "demons" or came back from the dead, but that doesn't make Jesus himself a myth no more than the false stories around Moses and Egypt make Egypt not a real place, or untrue legends around a battle make the battle a false event. Certain things can be true, such as the existence of Egypt or pharaohs while others are not.
I'm not that informed about this issue really, but I'd may as well put in my input on a few of these for the fun of it. I've never gotten into this debate. "The idea that Jesus was a myth is ridiculous." Whether or not someone considers it ridiculous doesn't make the Jesus myth idea any more or less accurate. So I don't see how this contributes to things that "show Jesus never existed at all." Not being ridiculous doesn't equal true.
"Ancient Historian Josephus wrote about Jesus." While I do believe that this is in fact a myth if I'm not mistaken, I don't see how it necessarily contributes to the Jesus myth idea. As far as I can tell, he was the starter of some small and rather insignificant (at least at the time) cult.
"Eye-witnesses wrote the Gospels." It's pretty much obvious that they didn't write the Gospels, however that doesn't make Jesus a myth. The stories could have easily been passed down orally before being finally written by someone after several decades. And there is always the mysterious Q source that we really don't know much about to keep in mind. The anonymity of the stories doesn't make Jesus suddenly an entirely mythical figure.
"The Gospels give a consistent picture of Jesus." Historians use redaction criticism in regards to this issue. Basically, the Gospels essentially follow one another and copy from one another while changing things to insert their own goals in what they want the messages and such to be. This doesn't mean Jesus didn't at all exist.
I think this rather makes the point well enough. I don't think there is any particularly good reason here to think that the stories weren't based on a real person. It could very well be for example that there was some guy that made a cult with a handful of followers, was crucified for some crime committed, and then the story was just gradually embellished from there. (Note that I just made this up off the top of my head as someone who doesn't know much at all about this.) From what I've heard from historians, or at least remember hearing, we don't seem to really have enough information to know how much of the Jesus's story is true. And maybe it is all myth? Maybe some guy had a strange hallucinogenic vision about this guy named Jesus that did all this stuff, and it just grew from there. But why should we really care? Such is all just baseless speculation. And its not as if we need to discredit the existence of Jesus to put up a decent argument against Christianity.
It was Christians who argue that their Jesus was not a human being. I don't know why people are claiming Jesus was a human being when it was a LIE according to virtually all writers of the cult.
Just thought I would make a quick reply to this as well. I believe that the general idea around Jesus, at least among modern Christians, is that Jesus was both fully God and fully human. Also, all the writers of the Gospels except one seemed to view Jesus as a purely human being. A prophet and the Messiah, but still just human. It's not really until the latest of the four, John, that Jesus becomes God. Paul may be a different story I think, but I'm not too knowledgeable about his views.