Surely I am not the only person who has heard many times over the years on the radio, in stores, as  part of holiday specials, etc. the perennial favorite song "Happy Holidays".  If a good Irish-American Catholic like Bing Crosby can make a fortune singing that phrase (his estate may still be collecting royalties) as well as another holiday song which uses the Hawaiian greeting for this time of year which I am not going to try to spell, then surely the rest of us need not fear using it.

  I use "Happy Holidays" when I greet people whom I meet whose religion I do not know.  It seems more polite to me than reminding those of other faith traditions that they live as minorities in a majority Christian country.  Or at least, a country filled with people who claim to be Christian.