Recently I've been teaching my kids about Christmas using games and Christmas vocabulary. All my students are taken aback when I explain how the elves work for Santa, making him toys year round. I try to explain that the working conditions are pretty good but when I get to the part about the factory location its a lost cause.
These kids are very bright, but when I ask them about the origin of Christmas they're all a little lost. I explained to the teacher in English that we celebrate Xmas because it was the day Jesus was born. She wasn't getting it and kept telling the kids that Jesus was born on Christmas therefore it was a big deal. I asked the kids.
Me: "Who is Jesus?"
Student: "Jesus means 'shimatta' (Japanese for darn it)
Me: "uh, ok sometimes. But who's son is he?"
Various answers " Christ's son", "son of an elf", and the most popular answer " Santa's!"
In Japan Santa enters through the window and most parents give their kid one present and put it on their pillow so they see it first thing in morning. That's a really nice image.