It would appear that the Christmas tree is based on mythology that originated in Babylon, which was then transmitted through Egypt and pre-Christian Greco-Roman tradition.
Nimrod, a biblical figure, was a “mighty hunter” and seen as the Saviour of the ancient world. As people were living in small, scattered villages with little protection from wild animals, Nimrod, highly charismatic, gathered people together to build walled cities where they could live in safety. Enlightened but also a bloody tyrant, they were obedient to him as their leader, until his violent death. One tradition says that he was killed by a wild animal. Another says that Shem, Nimrods uncle, and rival killed/ quartered him, sending pieces of the body of famed Tower of Babel builder to various cities in the realm.
After the mighty hunters death, Semiramis, Wife-Mother of Nimrod, produced another son, and proclaimed him to be the resurrected Nimrod. Her despair had taken her down to the world of the dead, to rescue Nimrod and bring him back.
She pronounced him to be a god, and she herself a goddess. The evergreen representing life, came to be the symbol of the resurrected Nimrod.
Today’s Christmas traditions harkened back to pagan ritual involving trees. The Roman Catholic Church inherited this tradition via the Isis Horus mother and child litany of Egypt and then through Greece and the Roman Empire. The Yule Log is thrown onto the fire on Christmas Eve, representing death and destruction. Similarly the Christmas tree with its decorations and presents is said to represent the ressurected Nimrod.
*Attempts to match Nimrod with historically attested figures have failed. He does not seem to represent any one personage known to history, and in reality is more likely a conflation of several real and fictional figures of Mesopotamian antiquity