
"Let them over whom the fires of hell are imminent affix to their posts laurels doomed presently to burn: to them the testimonies of darkness and the omens of their penalties are suitable. You are a light of the world, and a tree ever green. If you have renounced temples, make not your own gate a temple." - Tertullian
apparently Tertullian was no fan of "converting" pagan rituals. With many, mostly ignorant, claims that Christianity is nothing more then an adaptation of paganism I think he may have been right. Either way go to the following link for a very nice brief history of the Christmas tree