Mark may be Jewish, but I never thought he was a practicing Christian anyway. Did you see the appearance of the Google Logo on Christmas? It was stripped of any possible reference to the birth of Christ or even any reference of it’s secular popularity. That drab, innocuous logo was safely as generic as could possibly be. It seemed to refer to absolutely nothing out of the ordinary, nothing worth celebrating.
My guess is Bing as usual had a logo that said Christmas without fear or hesitation.
On the traditional holidays, Google will have an absolute cheesy-@ss image. I mean just total incoherent, gobbledygook nonsense that doesn't even relate to the holiday it's supposed to celebrate.
But when it comes to commemorating obscure leftists or someone lost in history, they'll do a full image of them complete with a link to their Wiki page.
Completely unrelated. Zuckerberg owns Facebook. Larry Page and Sergey Brin own Google (more accurately, Alphabet Inc, Google's parent company).