Yes, usually. Children's holiday books, including those for Christmas, often contain fictional elements such as talking animals or magical events. For example, a story about a snowman that comes to life during the holidays is clearly fictional.
In general, they are. Holiday books for children are full of stories that are not based on strict reality. They might tell tales of a child's encounter with a Christmas angel or how a family's Christmas was saved by a magical force. These are all fictional concepts. Of course, there could be some books that have a more factual approach, like explaining the origin of certain holiday symbols, but the majority are fictional.
Most children's holiday books are fiction. They are meant to capture the imagination of kids during the holiday season. There are fictional characters like Santa's helpers or fictional places like the North Pole in these books. However, some holiday books might have a bit of non - fictional information about how different cultures celebrate the holidays, but still, the overall tone and most of the content are fictional.