Some fun facts about Christmas traditions, brought to you by your friendly neighborhood atheist!
[youtube http://www.youtube.com/watch?v=7T8Y1-VLjGQ]
People would be amazed that 1) many non-Christians celebrate the holiday season and 2) many Christians unknowingly implement pagan traditions into their commemoration of the baby Jesus.
This video takes a quick glance at just a few beloved Christmas traditions and some of their origins.
Some other resources:
http://www.jesusneverexisted.com/nazareth.html
http://www.atheists.org/Did_Jesus_Exist%3F
http://www.history.com/topics/christmas