It's a house.
Anyway, when are presents traditionally opened in your global neck of the woods? In Finland, it's on Christmas Eve after Christmas dinner, but in the UK and the US it seems to be the morning of Christmas Day, at least if all the movies, TV shows and cartoons I watched as a kid were to be believed.
I wonder if there's any correlation between that and the fact that while most advent calendars available here have 24 doors, some have an additional door for the 25th, which I always thought meant that those were mainly made for the UK market.
(Of course, there are also advent calendars of the non-treat, more religious kind which have 25 or more doors)
I see no cross nor can I discern any kind of altar through tglhe windows
Its got a steeple though.