It is stupid to make a huge fuss over what are essentially religious idols.
There is no power given to a Nativity scene, none is claimed, they are no more a sign of religious devotion than images of Macy's red-nosed magical reindeer mascot.
Give Rudolph another tree or four centuries, and mystical powers might be bestowed on Rudolph, just as they have been bestowed on Mohammad's horse.
I don't think that we will be rid of superstitions of this sort in the future.
Newspapers still run horoscopes daily, even though they are seen as heretical by Christians (except for the Magi and the Star of Bethlehem of course). Any editor that has tried to pull horoscopes from a dail newspaper has been attacked by swarms of readers.
The actual Jesus, whoever he was IF he ever was, was not born on December 25, anyway; that was a winter solstice date and the alleged birthdate of Mithra.
The Star of Bethlehem is a myth, shepherds would not be grazing at that time and place, due to the absence of grass.
The idea that the Romans, who were most interested in tax receipts, would require people to go to their birth places to be taxed, is absurd. The logical way to collect taxes is to tax people where they are, not where they were born. Think about it: how could that possibly make sense?
The myth was created in conformity with the prophesy that the Messiah had to be born in Bethlehem, and Mary & Joseph were from Galilee.
But of course, I personally do not care about manger scenes, or the right to have many or one, or none, I will admit that the Mexican pottery ones were adorable. But then again, some of the greatest sculptures ever created were of imaginary figures: the Winged Victory of Samothrace, those Babylonian angels, statues to Athene, Zeus, Mercury, the Venus de Milo and so on.
It is a more artistic expression to put under a Christmas tree than gaily wrapped packages, after all.