I am a non-Christian and an immigrant. Heck I am totally non-religious and even an atheist.
So what if someone wishes me Merry Christmas? I will take it, with a big smile on my face.

Heck, I would take any good wish, in any language, of any culture and any religion. You know the best feeling is when strangers wish me Merry Christmas! It is great to receive a friendly wish from senior citizens walking on the sidewalks, people taking elevators, cashiers at the mall and last but not the least, SP's giving me the wishes, soaked in warm wet kisses while seeing me off at the door.
Frankly, I think the political correctness gets ridiculous more often than it really should. If saying Merry Christmas makes people happy, smile at each other and bring a sense of community, Great!!!
Merry Christmas everyone.
