The end of the international year is a period of holiday and celebration, and there's no need to be Christian for this.
Some of my Muslims neighbours, as well as atheists, will gather with friends and family the 25 December. Obviously not to celebrate Christmas, but to share their happiness while the year is ending; choosing that day because, well, everyone else is already gathering and celebrating, so why not them?
And I guess that it's to enforce this diversity and happiness vision of that period, that Sam and F95 decided that starting this year they'll goes for more neutral symbols than last year Santa's hat.
Yet, here you are, forcing religion into something that isn't religious. Worse, you're talking about Christianity and, therefore, fully discarding the fact that Jews are currently celebrating Hanukkah; to only name the most known religious celebration, apart Christmas, that happen in the second half of December.