Birdie's assertion that there is no contemporary reference to Jesus is contentious.
Because there are very few contemporary records - try and find any comtemporary records for anyone of that time and you'd be forced to conclude that there was almost nobody there.
It's more likely that his fame was exagerated than that he did not exist!
Moreover there is an alleged near contemporary record of him although at least one of the references is an obvious forgery.
This is Josephus
http://en.wikipedia.org/wiki/Josephus_on_Jesus (Caution on believing wikipedia on contentious subjects - this is a contentious subject!)
There seems to be little reason to think he didn't exist but there would have been many similar itinerant teachers at that time reputedly healing the sick and raising the dead. Look at the prolific number of witch doctors and faith healers in the world.
The only really special thing is that his teachings got taken up by Paul who spread them to the Roman empire, had them written down and most importantly of all that Constantine adopted them