@Flavia202
I have a Christmas tree in the hallway and a wreath on the front door. As I am a home host, I do display my Xmas cards on top of a dresser and I might also have some Xmas themed table decor (in moderation) right before Christmas.
I have never found any guests be offended by this, regardless of their faith or culture. Quite the opposite. Guests seem to love the tree in particular. It's something they expect when they come here to London even though the UK is actually a very secular society and not as Christian as some might think.
On the other hand, I've stopped going all out with cards, little gifts, crackers and decorations in the guest bedrooms. I used to leave these and even mince pies and little tipples, but I found that only about 2 out of 10 guests actually appreciated it. Overall, it was a bit of a waste of time.