It certainly is an entertaining topic of debate however debating it Christmas seems like a bad idea. However, I do have a couple of links to add to this thread that I have found informative on it.
http://en.wikipedia.org/wiki/Jesus-Myth
http://www.jesuspuzzle.com/
the second one is one of the most well put together sites on the subject I have ever seen.
In the link Solon posted I would find it really interesting if anyone has polled the US Christian popluation to see what they really know about other religions. I have found outside of religious debate forums most Christians seemed very ill informed about religion in general including their own though, as a number of Christians here have pointed out belief in Christ is a matter of faith as opposed to knowledge.
Also on the webpage Solon posted here:
http://www.thegodmovie.com/dvd.php
the points of
1) The early founders of Christianity seem wholly unaware of the idea of a human Jesus
2) Fundamentalism is as strong today as it ever has been, with an alarming 44% of Americans believing Jesus will return to earth in their lifetimes
# 1 it would be cool to read what they various early writers wrote about.
The current chapters of the Bible were elected by the catholic church but many more books and authors exists.
#2 Jesus is expected to come back in everyone's lifetime yet in generation after generation JC is late for his own party.
As a further footnote a web author notes that Nazareth (from whence Jesus came) is not mentioned in the O.T. Nor is Jesus early years included in the Bible and the writings on it. The Gospels of Thomas, which talks about Jesus's teen years are excluded from the text. Narareth is not even given a year of inception or when it was built.
http://holylandnetwork.com/nazareth/nazareth.htm
futher footnotes:
http://en.wikipedia.org/wiki/Nazareth
http://www.jewishencyclopedia.com/view.jsp?artid=141&letter=N
http://pages.ca.inter.net/~oblio/home.htm
I would really recommend reading the jesuspuzzle website it is a great read.