I think Christmas trees came from pagans who worshipped the god Odin.
I think the cross came from pagans who worshiped the god Jupiter.
No, actually Odinists regarded oak trees as sacred. There is a connection with Christmas trees, though, but it is decidedly anti-pagan. When the Hieromartyr Boniface, Enlightener of Germany, was preaching in Germany, he felled an Odinist oak tree. Subsequently a fir tree grew on the spot. The Christianized Germans took its evergreen quality as a symbol of eternal life in Christ. The custom of commemorating the Feast of the Nativity with lighted trees (arguably on the basis of this account) seems to have begun in the 15th or 16th century, centuries after there were any pagans from whom any customs might have been derived.
For ME now Christmas decorating
1. means a nativity scene and
2. Christmas cards from the past in all the windows,
*****that is, Our Lord's birth and family/friends.