Some of you Mother Theresa worshipers should read Christopher Hitchens on the old girl. Those orphanages and hospitals were hell-holes while she was in charge, and collecting awards and huge sums of money all over the world.
As for Christmas, I love the season, though I abandoned Christianity a long time ago. Most of the traditions, as others have correctly pointed out, come from pre-Christian spiritual practices. As for being offended, You might be offended, too, if you had a belief in another religion and everyone kept assuming you were Christian. Neither Ramadan nor Hannukah is an equivalency to Christmas in their religions. Our (Christians and Christian-heritage people) ability to "ignore" those two celebrations is made a lot easier by the fact that they make so little a dent in media and marketing.
I said years ago that I'd believe the old bigot's saw about Jews controlling the media as soon as I saw "It's Hannukah, Charlie Brown!"