Religions who have decorated trees in December:
Judaism (yes, many American Jews have "Hannukah bushes")
Pagan/wiccan/earth based religions (yule trees--the true origin of the Christmas tree)
"Judaism (yes, many American Jews have "Hannukah bushes")"
A bush is not the same a a spruce or pine TREE
Do pagan/wiccan/earth based religions use pine/spruce trees, if so, well excuse me for assuming that for the last billion years christians were the only ones using Christmas Trees.
There's no Jewish tradition based on decorating trees or bushes in December. Maybe Pagans do it, I don't know any pagans. Just about everyone I know who decorates a tree in december does it for Christmas, not even New Years, which I suppose is why they're called Christmas Trees.