Mrzzy - well - yes and noIt is a calender to mark the days from the beginning of Advent until Christmas. since Advent is a religious season of the Christian Church - guess that would make it inherently religious. *grin*
Usually takes the form of a scene with little numbered windows that you can open in order by day. Behind each one is a picture. Some have proverbs. Some have little presents, or chocolates!!!!!
Some form a second scene when all the doors are open; if so, it is frequently a Nativity Scene