Yes, it’s okay for Christians to have a Christmas tree–it won’t turn you into a pagan.
https://chalcedon.edu/resources/articles/the-christian-christmas-tree-2
The Christmas tree, Mark Rushdoony explained in 2018, is an allusion to the Biblical Tree of Life–a key image in both Genesis and Revelation. The Tree of Life is Jesus Christ. We partake of God’s grace in Jesus Christ.
We don’t have to surrender Christmas!
Just keep the cat away from the tinsel.