We celebrate the birth of Christ. On Christmas Eve (at my grandmas) he would read the Christmas story from the bible and serve communion.
The Christmas tree has something to do with a phallus for a pagan god than lost his somehow and the golden balls are the testicles. There was a cassette tape lecture we listened to at Christmas. Not every year, but enough. :/
I put up a thrift store silver tinsel tree in college and didn't tell him. I felt so weird and dirty, I guess it was guilt. Even now I don't decorate with santas or snowmen unless they were given to me. I still stick to angels, stars, and nativities.