You replied to my question. You didn't answer it. Big difference.
Man I remember when I was like 6 and I thought wait a minute, how is it possible that a fat guy is flying around the world with reindeer and coming down the chimney of every home to pass out presents over the course of just one night? That's when I stopped believing in Santa Claus.
I initially believed in something because people that were smarter than me told me it was true, but then I thought about it critically and realized that it was impossible. Once I realized it was impossible, I stopped believing in it.
I was 6. How old are you?