Think about it.... Beard, red clothing (he's a hemophiliac), aged white hair, beer belly from partying with dad for 2000 years, can see you when you are sleeping, he knows when you're awake, he knows if you've been bad or good, parents pass the story down to their kids from their parents, promises reward for good behavior, if you've been bad he gives you a soil specimen of the place you are gonna end up when you die
.
It all adds up I'm tellin' you
. (*cough*)