Pine is used everywhere, everyplace.
It makes as much sense to consign pine to a particular group as to consign the use of a building to a particular group.
Priests were using cedar in the time of Moses, ca1400; David,ca1000 was using evergreen in the Temple
Isaiah said, in about 700 BC, “Isaiah 60:13 “The glory of Lebanon will come to you, the pine, the fir and the cypress together, to adorn the place of my sanctuary; and I will glorify the place of my feet.”
That’s written history.
Yeah, NOW the pine is used all over the place. But it wasn’t part of the Christian celebration of anything until the 16th century.
Now you’re on track, consigning the pine to a particular group, like Christians, doesn’t make sense.
Nice written history, and what’s it have to do with Jesus’ birthday? Oh yeah, nothing. At least until the 17th century when a bunch of central European Christians decided they looked nice all decorated for those pagan holidays and why not use it for the Christian holiday.