God created trees. He made them for us: for home building, decoration, shade, construction of fences, tables, chairs, sheds, and so much more. Just because pagans might have carved up a tree to make an image of a false god to be worshipped does not mean that we can't use them to celebrate the birth of Jesus Christ, God's "indescribable gift" to us (2 Cor. 9:15).
Read Gary's article here: https://americanvision.org/posts/are-christmas-trees-pagan-symbols/
