In which country did Christmas first originate?
Christmas originally originated in Rome.
It originated from the Saturnalia that the ancient Romans welcomed the New Year, and has nothing to do with Christianity. After Christianity prevailed in the Roman Empire, the Holy See followed the trend to incorporate this folk festival into the Christian system, and at the same time to celebrate the birth of Jesus.
But Christmas is not the birthday of Jesus, because the Bible does not record when Jesus was born, nor does it mention the existence of such a festival, which is the result of Christianity absorbing ancient Roman mythology.