I agree with Shane Raynor - it's a loss when Christmas is secularized, but it's not a great loss. There are much worse things that can happen, as Michelle Malkin reminds us.
We watched The Grinch Who Stole Christmas this morning (the original cartoon with Boris Karloff's narration). I was struck by how the Grinch was "converted" by the Whos' enthusiasm for celebrating Christmas even when every material thing the Grinch associated with Christmas had been taken from them. There's a bit of wisdom there. Go ahead and celebrate Christmas anyway with all the joy and enthusiasm the holy day deserves, and maybe some of those Grinches who are trying to purge the day of any real meaning will see that they are removing a truly great thing from us.
Merry Christmas!