Regarding Santa having the attributes of God (white hair and beard, says ho, ho, is omnipresent and omniscient, judges who is good or bad, etc) not being detrimental to kids, consider this perspective.
One of the first (if not the first) thing a child "idolizes" is Santa... to an almost fanatic level... but hey, they are kids, let them have their fantasy, right? What happens when that child grows up, realizes that the premise of Santa was a lie, and now they are starting to get better acquainted with God...they read and hear how He has the same attributes as Santa had and realize, (subconsciously for most) that this turned out to be a lie the first time. Is it any wonder kids lose interest in God? Obviously, not all are affected the same way but no one can deny the danger of not only lying to your kids (teaches them that lies are ok if mom and dad did it) but also of compromising the effect of the HS on them throughout their life.