It annoys me when people get all grinchy about what others do. Your house is it's own wee culture, do what you like there. We are not religious at all, I feel far closer to the Celtic idea of a celebration to brighten the winter than any notion of Jesus, or any faith kind of stuff. We celebrate loads of occasions that are not ours culturally, just because it is fun and I want to get maximum joy from life. Christmas is my favourite time of year and I will take my pleasure gleefully not giving a shite who agrees.
December 1st, mugs, bedding, cushion covers, advent calendars, elves, Christmas PJ's and jumpers all out. The first weekend in December, the decorations mostly going up, so I can enjoy seeing it all. Then it will take a few weeks to gather all the bits we go for walks and forage for, as I do my wreath, mantelpieces etc with holly, evergreens etc, we spray paint fir cones etc. I do not care about the 12th night stuff, it has no relevance to me. So I will take everything down the first weekend after the new year.
That is how we do it, because it suits us. The lovely thing about having choices, is that other people get to do it entirely differently, in whatever brings them joy.