faith is just that, belief in something unreal, unprovable; a decidedly human affliction. religion is a great joke to pull on children, and probably one of the best gags mankind has ever proffered; the ultimate andy kaufman bit.
teaching children to worship satan would be abhorrent, if not really metal, but consider:
from a christian mindset, is there anyone more wayward and in need of others' prayers than satan, the biggest sinner of 'em all?
my guess is they'll grow up, reject the 'rents values and become bible-thumping, brylcreemed, teetotaling, tongue-speaking, snake handlin' types.