Maat, I teach our children about the Solstice, and the religions that honor it, at this time of year.
Here is a condensed version, hope it helps (accurate for the Northern hemisphere only):
"For thousands of years, our people paid attention to the seasons. They measured the length of the days and nights, the summers and the winters. They made calendars to help them to remember special things.
Long ago, those wise people figured out that there was one special winter day each year, when the day stopped getting shorter. We call that day "winter solstice," and we eat special foods, light candles, and build a fire against the long, dark night.
There is a special day right after the winter solstice. It is the first day we can tell that the days are starting to get longer again, and we know spring is coming. Our people call that day "Yule," and it comes on the evening of December 24 and the day of December 25.
Other people call that day by different names, and celebrate it differently.
The ancient people of Rome worshipped a god called Sol Invictus, whose name means "the unconquered sun." His special day was the same day we celebrate Yule- 3 days after the winter solstice. The early Christian Church decided that Sol Invictus' special day was a good day to celebrate the birth of Jesus, so December 25 became "Christmas". The Christians also call Christmas "Yuletide," although most of them don't know why.
Some of our people's Yule traditions are celebrated by other people. The "Christmas Tree" and wreaths of evergreen are Pagan things. "Santa Claus" looks like the Holly King, even though he has a Christian name. Mistletoe and holly are powerful Pagan herbs, but people who are not Pagan still kiss under the mistletoe, and "deck the halls with boughs of holly."
Even if they don't know it, or know to thank us for it, people all over the world enjoy Christmas because of our Pagan people."
The Pagan Preacher
I don't turn the other cheek.