happy winter celebration to the muslims.
Muslims, believe in the miracle birth of Christ (it's in the Qur'an) - They say Jesus is one of the great prophets - They also believe he is Christ, Lord, Son of God and Messiah (although - their meanings differ from Christianity).
...And so, although not a muslim celebration, i doubt they would be that offended by the birth of Jesus.
Besides...Jesus is a spiritual figure for all religions.
And so happy 'winter celebration' to all athiests!