Quote
Relztrah said:
I got to thinking about this and wondering just when the church began celebrating Christmas. I could probably do some research and find the answer, but with this erudite body, I'm sure somebody knows the histroy of this celebration. I've heard that Dec. 25th is somewhat of an arbitrary date and was probably already a pagan holiday that became christianized in the Roman empire. Just guessing.

December 25th was not chosen until 350 A.D. :
http://www.briomag.com/briomagazine/briobeyond/a0005699.html
In A.D 350, Pope Julius I declared Dec. 25 the official date of Christ’s birth.