I read a first-person story about a Jewish woman who grew up rather sheltered. When she did finally visit the home of a gentile friend over the Christmas season, she was scared of the tree! Scared of a Christmas tree.
The tree is not holy. It will not burn you or convert you. It might even yield a gift.
I've been unreligious for a long time, but I still put up a tree, and I call it a Christmas tree. Nobody's zinging bolts of lightning at me for that. I think I'm safe.
You wanna say "holidays" instead of "Christmas"? I'm OK with that.
But I will not have Bill O'Reilly telling me what to do.