The answer is simple. You don't need anyone's permission to stick a tree in your living room and cover it in lights. Whether you call it a Yule tree, a Christmas tree, or a Festivus Fir, it's entirely up to you. Let's face it, trees are nice, and it's comforting to bring one into your home for a few weeks and celebrate the season. Pair that up with the fact that most of us grew up with a tree in our house every December, and there's absolutely no reason why you can't have one if you like.
If it helps, you might want to keep in mind that the ancient Romans -- who were most assuredly Pagans -- decorated trees and bushes outside their homes during the winter season, and often brought boughs of greenery inside to celebrate Saturnalia. Despite what the War on Christmas Brigade would have you believe, the Christmas tree really does have some fairly Pagan origins. So go ahead, and put up your Yule tree. Want to try a ritual to honor the spirits of the tree you bring into your home? Check out the Holiday Tree Blessing.
Don't forget to sign up for the free Seven Day Yule Class!