Again, I have nothing but contempt for any group that would attempt to force speech on others. But you're right, I disagree that their attempt to be inclusive of all customers is an indication that they want to remove Christmas from our culture. That seems somewhat paranoid to me - that in a nation that you say is 85% Christian that it would even be remotely conceivable to remove Christmas from the culture is impossible for me to comprehend. I would guess that the bigger threat to traditional Christmas values would be the rampant commercialization of it, not the saying of generic greetings.
You don't understand the secular threat from the left in this Country, and their stated goals.