"For if men do these things when the tree is green, what will happen when it is dry?"
The origin of the Christmas tree has it's roots in the ancient Roman holiday of Saturnalia - a pagan celebration of the unconquerable sun. Many pagan temples were decorated with greenery and candles. For this reason, Christmas trees were prohibited by the eary Christians and are still opposed by many in the church today. Yet the apostle Paul instructs us to follow our conscience (Rom.14:6) and he also admonishes us in 1 Cor. 10:31 to give God the glory in all that we do.
The purpose of Christ coming into the world was to offer atonement for sin. He is the GREEN TREE in Luke 23:31 - a tree of purity and perfection undeserving of any judgement. Peter describes his sacrifice on a TREE for our sakes (cf. Deut. 21:23) that we might be healed. Again, in Revelation 22:2 the TREE OF LIFE offers healing to the nations. Those are the trees of Christmas and the miracle of the gift of Emmanuel - God with us.
For some, the Christmas tree is rejected because it is a Christian symbol, for others it is a pagan custom but to God what matters most is the condition of our hearts as we prepare to worship His only begotton son, Jesus. This is the true meaning of Christmas.
Father, help us to celebrate the birth of your Son with a pure heart as we offer our praises to You in thanksgiving for the precious gift of your Son, Jesus.