The point, or at least the best part from my perspective, is that you as a parent can enjoy watching your children's minds grow and their reasoning powers develop, to the point where they reach milestones... like being able to reject BS when they hear it... including appealing BS.And in what other ways our trusted figures are fallible (and how likely it is we're wrong too). I'm still not sure how I'll handle Christmas type stuff if I ever have kids, but I'll probably refuse to tell them either the truth or the lie, put the presents there all the same, and tell them that it's up to them to figure out the correct belief and why they believe it. That would be a fun exercise.
The difference, is that on the Santa Claus question, parents are almost universally gratified on some level to see their children get to the point where they can reason out for themselves that its make believe, but still wholesome good fun... But on the Bible/religion thing, ... for many people, they can't allow their children to reason it out, and in fact try to prevent them from doing so, or even shame or guilt-trip them for it.