Naw, he's a Laplander shaman who would harvest, process, and deliver the amanita muscaria mushrooms to locals for some holiday cheer and psychedelia. Their Yurt doors would often be snowed over by this time, so he'd have to get in through the roof. Drying the colourful mushrooms on the pine trees before he put them in the sack is where the "Christmas tree decorations" we call came from (I don't recall many pine tree's around Jesus' stomping grounds so I fail to see any connection to him), and yeah, his red and white suit comes from shamans dressing up like their medicine (red and white mushroom), and the reindeer and sleigh... well there were no SUV's in Norway in the 800's. The flying thing... probably had something to do with the mushrooms. Only fable I've heard which kind of makes sense...