Somethings gone wrong

Spending some time at my friend K's house this evening I analyzed her homemade Xmas tree topper, "3 angels." Each angel (looking more like nuns to me) represents a roommate in the house complete with matching hair colors. I asked to be included in the tree, which K replied with no restraint, "you can be satan!" So I promptly made sure to include myself on their tree as the picture shows. My cousin's wife started a holiday nativity scene years ago using her troll dolls. She's posted a picture on her blog. She sets out this nativity scene every year during the holiday season complete with a satan troll (though all trolls like a bit evil to me). Since when do we start including satan in our holiday festivities? I don't recall seeing a collection of hallmark cards that say, "Seasons Greetings" with Satan sketched on the front side.