On the one hand, there's nothing Christian in the origins of Christ's Mass (where the name came from), it was an attempt to put a Jesus Halloween mask on a pagan holiday in the same way that the Conservative Jesus is simply Mammon dressed in a Jesus mask.
Jesus never celebrated his birthday, it wasn't Jewish or Christian custom to celebrate birthdays until after 400 AD.
I once asked God why he allows pagan holidays to be celebrated in his name. He answered, "You know what you know, but don't hurt my children." If took months for him to impress on me that, "There will be no pop quiz on doctrine at the Judgement Seat." It isn't what you know that matters, it's what you do.
And Christmas brings out the best in some people and the worse in others. It brings out the greed in some, and provides others an opportunity for their charitable hearts to find expression. So, I say, for those who use the season to feed the poor, comfort the sick, quench the thirsty, visit the imprisoned (Matt 25:31-46), Merry Christmas! And may THAT spirit of Christmas last throughout the year.