Matthew 2:9-11
9 When they had heard the king, they departed; and, lo, the star, which they saw in the east, went before them, till it came and stood over where the young child was.
10 When they saw the star, they rejoiced with exceeding great joy.
11 And when they were come into the house, they saw the young child with Mary his mother, and fell down, and worshipped him: and when they had opened their treasures, they presented unto him gifts; gold, and frankincense and myrrh.
As per the point made already, if we celebrate any birthday, surely Jesus' birthday is the most important one to celebrate, and has the most biblical support? If we won't celebrate Jesus' birthday, surely we shouldn't celebrate any?
I think the charge of legalism comes in where one decrees that anyone who celebrates Christmas or supports it is supporting evil.
This exactly was the point I was intending to bring up next, but you did so with much more knowledge than me. To me, the heart of the attack on Christmas isn't that December 25th is the wrong date. If this was the case, and those against it celebrated on the 25th of April, or whenever date they believe Jesus really was born (or conceived - the important theological issue is the Incarnation - when God became Man), I wouldn't have a problem. My issue is that the purpose of this seems to be to eliminate the mention of Christmas in association with Christ. And then where to next? The Resurrection, of course, because of yet another long-dead, long-forgotten pagan. The core of the issue isn't about the dates being wrong, or the dates also coinciding with some long-dead pagans (and which dates don't, by the way?) The core of the issue is elimination of the Christian Holy Days, but this effort thus far has been unsuccessful from without the Church, so it is being attempted by sinister means - holy-sounding arguments and justifications to do so from within.