It’s pine because it’s evergreen, and it goes back to 15th-16th century Christian Europe. The first tree with lights was by Martin Luther.
And the incidence of followers of Odin is a bit on the low side these days.
When they step forward in vast numbers, I’ll loan them a log. In the meantime, I’ll consign them to Marvel comics.
You got it part right. What you missed is that the pine was used in pagan winter solstice festivals before Christianity got within a thousand miles of the place, hundreds of years earlier.
Actually I know a Loki worshiper. I don’t know if she puts of a tree. One of my Jewish friends likes to put up a tree, all white and blue lights.
The fact of the matter is the primary symbols of Christian celebration of Christmas are mostly borrowed, and are still shared. They really ARE holiday trees, whether you’re willing to admit it or not.