My wife and I went to our granddaughters nativity play yesterday (she's a few weeks from her 5th birthday). It was joyous to see her and all her little classmates singing and performing.
What does it matter that the story is mostly myth and fable? It was an end of year opportunity for the children to shine and the parents/grandparents to get a little dust in their eyes.
Christmas is the same. The fiction doesn't matter, the people you love do.