A childhood belief about father christmas

I once convinced myself that nobody knew for sure whether or not Santa Claus, Easter Bunny, or the Tooth Fairy were real(because I assumed every belief was unknon for sure). When I figured out there was no Santa Claus, Easter Bunny, or Tooth Fairy(which was because I heard my sister say that one of her classmates didn't believe in the tooth fairy, she thought it was just your parents sneaking up on you), I convinced myself, "Is there a Santa Claus, Easter Bunny, or Tooth Fairy? Nobody knows for sure. Some people believe there is one, others say it is your parents sneaking up on you and that the letters are written by volunteers at the post office and the emails by people who created websites. But if it is your parents sneaking up on you and this is where the letters and emails come from, the parents can't see themselves doing it and don't know that they're doing it. And the toy sellers and manufacturers can't see themselves issuing presents to Santa and the Easter Bunny(sometimes the Tooth Fairy did give presents rather than money).