We're a mixed up bunch in our house.
Raised catholic. A scientist and an engineer. Lapsed (mostly due to the scandals over the years, and a healthy skepticism). But not totally non-believing either. Ill relatives in recent years, and supporting others - have kinda meant a return to a form of Catholicism/Christianity while not really being totally devout.
Anyway;
We've always had a crib - always. We got a lovely big one as a wedding present from a DGreatAunt who was a nun (our wedding was not long after Christmas) and I love that. We also have a small wooden one, and a tiny one glued into a rose-shaped ring box that DD has up in her room.
We have always done the Irish traditional Christmas Candle, lit by the youngest in the household. In our case, we've evolved my family tradition of having a family gathering to light it and to talk about the milestones of the year, with a decade of the rosary - to talking about the good and bad of the year, remembering all the extended family no longer with us, and saying a prayer together.
We go to mass on Christmas Day. Always. Even the year that DD was born on 26th, we still got to mass on Christmas morning.
I try to get to a carol service as well - the one with 9 readings and lots of carols. t doesn't always happen, but I do like to. And I also try to get to some other musical celebration, most of which involves carols rather than more secular music, in person. The chamber choir from the music conservatoire in our city does a lovely concert one lunchtime.
I nearly always manage to make time to visit the various graveyards over Christmas - for my grandparents, DH's Dad, and a few other family and friends who have died (2 graveyards in our city, and 2 more near where we grew up). And I also make time for a quiet walk in either a woods or on the beach at that time of year for some quiet contemplation.
And among the collection of Christmas books for DD, there are a couple of bible stories books with the Christmas story in it. Which are still among those she re-reads a good bit.