So it's based on tradition. I can't argue against that except to say it didn't really become tradition until hundreds of years after Christ died.
The celebration of Christmas simply gives a special time of year for Christians to remember and celebrate the birth of Christ as told in the New Testament. What's wrong with that?
Christ created holy days to mark, signify and portend what God knew to be important for man. Christmas was not one of these days. Christ also commanded to walk as he walked. He did not celebrate his own birth or command his followers to celebrate his birth. Instead, he observed the holy days that he himself created. Christmas distracts and pulls people away from the truths that are contained in the true, holy, days that he created.
The NEW TESTAMENT didn't become tradition until hundreds of years after Christ died (Around 150AD).
Also Christ was in fact BORN that is in fact what established Christmas.
If Christmas is a meaningless exercise why did the apostles who wrote about Christ birth do so? Why waste that time in scripture?
Exactly what holy days did Christ direct his followers to observe? I don't recall any particular admonition to following any certain calendar of events.