I've heard this discussion before, and my position is pretty simple:
This country was founded based on Christian beliefs and principles. Christmas is the Christian celebration of the year.
Merry Christmas.
If you don't like to hear or see that, don't look or listen.
I acknowledge your right to do so.
And don't tell me I have no right or that I am racist or politically incorrect when I say or write it.
I won't look or listen if you do.
Go find something else to be offended about. I'm sure you have plenty to choose from.
And again . . . . Merry Christmas.