That is totally irrelevant.   The United States is less than 250 years old.   And the Pilgrims founded the Plymouth Colony just 397 years ago,

Christmas in the United States has ALWAYS been a celebration of the birth of Jesus Christ.  For anyone to say otherwise is to show a total ignorance of our nation's  history.

If people hate Christmas and Jesus Christ that much, there are a number of countries around the world where Christmas and Christianity are forbidden, that they can go live in.