A long time ago, no one said Happy Holidays. Christians called the time of year when their Lord was born Christmas. Those who were Jewish lit candles for Hannukah. And atheists went to parties and drank.
People said "Merry Christmas" when they were Christian, and "Happy Hannukah" when they were Jewish, and everyone said "Look out for that wall!" to the atheists.
So Merry Christmas, Happy Hannukah and look out for the wall.