We don’t know the actual day or month of Jesus’ birth. For all we know, he could really have been born on December 25. All that is important about the date though is that December 25 is the date the Church chose on which to commemorate the fact of Jesus’ birth.
DISCLAIMER: Catholic Answers has turned over the archive to Catholic-Questions.org and no longer owns, manages, or moderates the forums. For additional apologetics resources please visit www.catholic.com.