“Unto you is born this day in the City of David a Savior, who is Christ the Lord” (Luke 2:11).
Just tell the story.
Get over the need to be flashy, cutting edge, different. Just tell it.
Tell the story with faithfulness and respect. Tell it accurately and fully, bringing in the accounts of Matthew and Luke, drawing from the prophecies of old.
Tell it with gusto and love. Tell the story of the birth of Jesus with all the excitement of someone hearing it for the first time. Tell the story without detouring into theories and guesses and myths and controversies.
Your Christmas sermon is no time to conjecture on how planets aligned themselves into creating that wandering star which led the Magi to Bethlehem. Keep in mind that it “went before them until it came and stood over where the child was” (Matthew 2:9). Try doing that with planets. Stay on the subject, pastor, and don’t waste your time.
Your Christmas sermon should not waste everyone’s valuable time on the pagan origin of Christmas or the history of Augustus’ census, unless you’ve found something worthwhile, pastor. Mostly those are fillers.
Stay on the subject.