Wow, people are really getting all worked up over this subject.
Most Biblical scholars today agree on, that something like 95% of Gospels are legendary material, that is mostly borrowed from the Old Testament as a form midrash and then padded with some rewritting of Homer's legends, mostly the Odyssey, but also the Iliad.
The epistles contains large number of interpolations and some are out and out frauds, that much is agreed on by just about everyone. Those of Paul's epistles that is believed to have been written before Mark, shows little or no knowledge of the Material that went into Mark or even of a body of Jesus sayings (the fabled Q). Paul is very clear in that he never meet Jesus and that all his knowledge has come through divine revelation.
As it stands today you can have the position that Jesus of the New Testament is based on a historical cult leader that has been greatly mythologized to the point where we today don't know anything about the man behind the legend, this is my own personal view, or you can come from the other side and say that Jesus was a legendary figure from the start that slowly got written into history. It comes out to almost the same. Either we have a shadow figure that is no longer visible behind the veil of myth and legend or there is no figure behind the myth and legend. It makes no real difference.
That might have been true before the Dead Sea Scrolls were discovered. Also the material from Nag Hammadi has given us a much greater insight into early Christianity and second Temple Judaism.
When all of these things are viewed together along with an understanding of the Historical context provided by Josephus and others, it is difficult to imagine Christianity starting without a Historical Jesus as "patient Zero" as Eight Bits puts it.
Here is an interesting Blog that you might find informative:
http://www.huffingtonpost.com/robert-eisenman/
Or you might like to read my perspective in this thread:
http://www.internationalskeptics.com/forums/showthread.php?t=267096