An Evergreen tree? A Yule Log? Mistletoe. Decking the halls with boughs of Holly? Sleigh bells ringing? Doesn't bring to mind the birth of Christ in the Middle East (most likely in the spring) to me.
Don’t forget the date of Christmas was chosen to frustrate Mithras worshipers.
That said, such things are simply further examples of the triumph of the Church and Christ.
How are Europeans supposed to decorate? Bring in sand and palm trees?
Of course they decorate with stuff native to their landscape. Grinch!
Speaking of whom, the Whos of Whoville had a perfectly nice Christmas even after the Grinch took all their European trees and ornaments.
Christians are going to celebrate no matter what anybody does. So we don’t know the proper date. We picked one. It’s the best holiday ever.