When I was 8, I asked my mom point blank and she told me the truth. She explained that it was all part of the fun, and even though I was a little pissed at first, I got over it. I had a few years of fun with it, and when the time came for it to be over, I understood that my parents loved me and wanted me to enjoy a little childlike wonder. Christmas presents started to mean even MORE when I realized that my parents where the ones making the sacrifices to do something nice for me.
Frankly, I think fantasy and imagination are the best parts of childhood.
Anyway, no debates. Just my .02. You can fight amongst yourselves!
edit: Just to clarify... If it is against your religion, fine... just don't call those of us who like the tradition 'evil'! Everyone should be allowed to express the joys of the season however they want, be they Christian, Jewish, Muslim, Atheist, or those celebrating Kwaanza... Just be happy, darn it!