When I was a kid of 8 or 9, I read the Ten Commandments for the first time (our family was not religious), and upon coming to "Thou shalt not commit adultery," asked my mother what "adultery" was.
She was not aware of what I had been reading, but explained, quite accurately, that adultery was putting water into wine or other alcoholic drinks to make them weaker.
For a long time I thought, "Man! God is REALLY SERIOUS about making sure people get what they pay for in a bar!"
A childhood belief about church

others believed things like this
- I thought adultery was when you acted too much like an adult as a kid and wondered whats so bad about that?— Butch McFear
- When I was little I thought that if I stayed a long time in the water I would become a mermaid.— Salma
- I used to think that if I stared at the sun for a long time, I could make day turn to night.— Big J
- I thought that when the lights went out, putting a candle behind the tv would make it work :)— Ricky
- I used to think that the smoke coming from the factories were actually making clouds Anon
- i used to believe if i went to sleep monsters would get my family, so i thought i stayed up all the time— Luc Lemmel