Biblical Christianity is not limited to one culture. The earthly biblical heritage of Christianity is the Ancient Near East, which has influenced Asian, African, and European traditions. In short Christianity addresses not the heart of a particular culture or ethnic background, but the heart of man. Sin is not limited to one culture. It is deeply ingrained in all cultures. Wherever there is man, there is sin! Thus, God has revealed his righteousness to all the nations. All of the ends of the earth have seen the salvation of God. God chose a time and place in the timeline of human history where the message of the gospel would be spread to all the earth. So, Christmas is about the survival of mankind. We don't just celebrate Christ's goodness to us, but we celebrate that God has made it possible for people from all over the planet to be saved from their sins. Apart from the Lord of the Universe coming to Earth to die and rise again on the third day, there would be no hope.