Martha, I am like you, either Happy Holidays or Merry Christmas, I am glad to hear it. I love to hear it from my friends who do not celebrate Christmas, when they generously offer it in gracious recognition of my beliefs.
But when it comes to someone wishing someone else Merry Christmas who may be suffering...the original message of Christmas is rejoicing not so much in the good things of health, wealth, and being with loved ones...but triumph over the darker and not so good things.
Think of it--a baby born to a mother whose betrothed husband almost left her alone in her shame. A baby born a citizen of a small country, ruled by a powerful and wealthy nation, so powerful that when the smaller country's ruler felt threatened by the birth of this child--a prophesied king--the ruler could put to death all the little babies and children under two years without hesitation.A baby whose birth gifts included myrhh, for his own death.
We have come to expect that Merry Christmas is accompanied by comfort always, forgetting the generations that said the phrase while enduring wars and suffering and hardships.
I believe we must celebrate Christmas not only as thanks for the blessings we have received, but as a celebration of the triumph over earthly suffering that Christ brings.
So, Merry Christmas, indeed.