Should we have a Christmas tree?
It is up to you.
There is nothing in the Bible that either commands or prohibits Christmas trees.
Jeremiah 10:1-16 is about Baal, not Christmas tree. Isaiah 44 is about idol, not Christmas Tree. Christmas tree originated in Paradise Play. In the play, Christmas tree is Paradise tree, i.e., the tree from which Eve took the forbidden fruit and gave it to Adam. Christmas tree has been nothing to do with any pagan customs. No evidence showed causal connection between them. So, any causal connection proposed without proof is proc hoc ergo propter hoc fallacy.