Unlike those other historical figures you listed, there are no contemporary accounts of Jesus, including Josephus. That's a really stupid fuging thing to suggest and a pitiful comparison.
As far as inspiring a belief system, can I assume you then believe Muhammad to be the one true prophet or what
Without turning this into a tinderbox debate, let me assure you that I could utterly and thoroughly destroy you in any debate regarding ANE history and culture. Secondly, seeing as Mohamed spawned a belief system no one questions whether he actually existed, which is the only point I was making. Whether Jesus performed miracles or was resurrected is irrelevant to whether he actually existed, and unless you wish to posit that thousands of people collectively invented a contemporary figure of reverence in a manner never before achieved in human history (since the myths of Hercules, Gilgamesh, etc. all concerned historical figures in their own time) I would be safe to say the historicity of Jesus existence is only a topic for imbeciles. Those who argue the topic do so demanding a weight of evidence not required from contemporary figures of that time, and assuming some sort of fanciful mass delusion better reserved for Dan Brown novels.
The reason that some figure called Jesus had to exist is because the figure defies all archetypal attributes associated with myth: he was of a commoner trade, had no martial aptitude, was not the progenitor of philosophical trends, was followed by fellow commoners, and died in a brutal, non-heroic, emasculating manner reserved for criminals. If anyone wanted to invent a figure for mass reverence in the culture of that time he could not have created a less likely character to engender such feelings. To quote an atheist historian friend of mine: "If Jesus didn't exist then neither did Alexander the Great." In fact the topic angers him because he feels the amateur anti-religious zealots taint the field by treating it like their personal playground where they are free to remake history to suit their personal preference. We can't help that history can't be proven scientifically, but then again we can't convince people that Obama was born in Hawaii, so such is life in the land of the dumb.
It is perfectly valid to question whether Jesus did all the things attributed to him; it is not reasonable to assume he didn't exist at all because he didn't sit in your lap and say "Hi!"
For an atheist's view on the ridiculousness of the topic: http://armariummagnu...t-show.html?m=1