You know that song, The Twelve Days of Christmas? It's actually a thing! In the old days (and today in some churches) Christmas was a twelve-day-long season. It began on December 25, and it ended on Epiphany, January 6. Epiphany is a Christian holiday that celebrates the Wise Men bringing presents to Jesus.
So another way to keep Christ in Christmas is to lengthen Christmas a bit. Instead of pitching your tree on December 26, keep it up until the 6th. Stream some Christmas carols the first week in January.
Another idea: read Biblical stories that focus on the birth of Jesus between Christmas and Epiphany. There is a thing called the lectionary--it's a list of Bible passages to be read in church or at home. Here is a link to an online lectionary. At this link, you'll find passages for every Sunday of the year and every day of the year. As you read these scripture passages between December 25 and January 6, ask yourself, "What is God saying to me about the birth of Jesus Christ in this portion of the Bible?
At First Presbyterian Church, Christmas is a season, not just a day. The tree will still be up on Sunday, December 31 at our 9:00 AM and 11:00 AM services.
On January 7, the day after Epiphany, we will have an Epiphany Breakfast at 9:30 AM. Join us for good food and an Epiphany-themed program starring the children of our congregation. That day we will have a single worship service at 11:00 AM. The theme of that service is the Baptism of our Lord, which is the next great event in Jesus's life after his birth.