I've never had a Christmas tree.
Never bought one. Never decorated one.
I grew up in a Muslim family in Iran and moved to the US about a decade ago. Every Christmas, I watch as my non-Christian friends get in their cars, drive to a Christmas tree lot and pick out their favorite tree. And I wonder why.
When I ask them, they say it's because they want to get into the holiday spirit. Or, that it's pretty and smells good. If they have kids, the answer usually is "the kids love it."