Regarding Winter celebrations, I'm all for it so long as all references to the nazarene are completely filtered out. No mangy manger scenes unless modified or desecrated. No carols with references thereof, or only instrumental or modified lyrics.
An indoor yule tree is artificial, and otherwise a living tree on premeses. All Dracorations are diabolical and/or Halloweenish in nature with an added Wintery touch of Evil.
The Hellday is referred to as Wintermas, Satanalia, Yule, Solstice.
Anthropomorphic icon referred to as Father Winter, Satan C/Klaws, Krampus. ∞