Well, that was from a survey. And people lie on surveys.
My Mom used to tell people we went to church on Easter and Christmas. Well, yeah- like once each. But she wanted people to think we went, although we didn’t hardly ever.
Manger scenes, at least around here in LA CA are rare, and never on public property. As I have said before and have shown from "top Christmas songs’ lists, etc, overtly Christian carols being played over the airwaves or in stores, malls etc are well less that 5%. All I ever hear is Little Drummer Boy and Silent Night of that ilk.
Now sure churches do a land office business on Christmas, but remember a good % of church goers see it as a community or social gathering.