It's Winter Solstice. Just called Christmas by Christians back in the day so they wouldn't be persecuted. Today, has nothing to do with Jesus no matter what Christians say. A tree, in this sense, is an idol. You give presents on birthdays, it's not everyone's birthday on Christmas day, so all those gifts should be to Jesus. So presents have nothing to do with Christmas. Sleighs, reindeers, Santa, Jack Frost, the Snowman, etc., what do they have to do with Christianity? Nothing. They would, like a tree, be considered "idols".
It's a pagan holiday. Always has been.