You've got it backwards. It is Christians who are being forced to censor themselves and not use correct words to describe the Holy Day and Federal Holiday which is the subject of the parties, cards, festivals and pageants that take place in December.
I will say this again for the umpteenth time: if the word CHRISTMAS is good enough for the Congress and the President (in the law they passed in making it an official holiday) it oughta be good enough to grace greeting cards, parties, pageants, and festivals.
It is a perversion of the language to say Happy Holiday or Seasons Greetings when the Holiday and Season to which you are referring has a name, bestowed by the Congress: Christmas.
And, guess what: not everyone who says "Merry Christmas" is referring to the Christian Holy Day. Some are referring to the Federal Holiday.
We have 10 Federal Holidays and all except Christmas are routinely referred to by their proper names. Labor Day is Labor Day. Thanksgiving is Thanksgiving. But "Christmas" is unutterable. Heaven forbid we should call the day by its proper name.
Where? I just bought my Christmas cards today and I was free to choose the ones I wanted and there were plenty about Christmas and plenty with Santa Claus or snowmen. Nobody forced me to buy the latter and I chose, as I always do, the former.
Your problem is you want everyone to have your point of view and they don't and never will. There are plenty of Christians who observe Christmas in a religous manner, so spare us your condemning of others.
I say both, Merry Christmas and Happy Holidays (as I think of Christmas and New Years as two *Holidays*). Tough toenails if that grinds your grits.