I think it is great Sears acknowledges and uses the phrase "Merry Christmas". The same with wal-mart and any others. They also say Happy Holidays as well. Yes, we are in "the melting pot" which is actually more of a salad, then melting pot, but that's neither here nor there. However, it can not be ignored that we live in an Country, better yet, on a Continenant that is by the vast majority one that celebrates Christmas.
As an employee of a retail business, I have no problem saying Merry Christmas, Happy Holidays, Happy Hanukkah, Happy Kwanzaa or whatever. But as it stands, a safe bet is that whoever I talk to, they celebrate Christmas, and NOT X-Mas either, but that's yet again neither here nor there.

To quote Honest Abe, "You can please some of the people all of the time, you can please all of the people some of the time, but you can not ever please all of the people all of the time".