Here’s the thing. Christmas doesn’t really belong to you. At least not in its entirety. And the fact of the matter is that it never really has. Human beings have celebrated Midwinter festivals in one form or another for thousands of years. The many layers of tradition, folklore, and celebration of our modern Christmas have been handed down to us through hundreds of generations of human history and are not limited to a single storied birth which very likely didn’t even occur near the winter solstice, if it occurred at all.
Christmas, as much a secular holiday as a sacred one, belongs to everyone. I’m terribly sorry that you don’t care very much for sharing your sacred holiday with the unwashed heathen masses, but it doesn’t change the fact that you DO share it. Further, the secularization of Christmas doesn’t make it any less sacred. Celebrate a sacred holy Christmas in your places of worship and stop lashing out in annoyance at those whose celebration is more secular. Keep Christmas in your own way, and I’ll keep it in mine.