Merry "Holiday"?????

I am offended by those who wish to say Happy Holidays and not Merry Christmas!  What do you think this holiday is about?  Where do you think it came from?  Why do we have to worry about offending a very few people?  I am sure I have unintentionally offended many people throughout my life.  And by the same token, many have offended me.  But I didn't make a big hooplah about it.  I went on about my way.  If you are offended because I say Merry Christmas, get over it.  Don't say it back to me.  My right to say it is just as important as your right to not want to hear it.  If it weren't for "Christmas", there would be no "Happy Holidays".  Gripes me to hear that entire stores have changed their policy on this.