I told the cashier at Belk's yesterday "Happy Holidays" in an attempt to be PC and keep from offending anyone. She smiled and said, "Merry Christmas!"
I was so happy to hear a retail person say those words! I thanked her for her greeting, and mentioned how thrilled I was to hear "Merry Christmas" being used. Every person who was behind me in line chimed in to say that they were happy to hear it, too. I walked away with about ten people calling out "Merry Christmas" behind me. It was nice.