When I was 5 or 6, I recall being taught in church about the dangers of drinking and how no one should drink. Nobody ever mentioned "alcohol", though, so I thought everyone was a sinner for needing to drink water.
A childhood belief about church

others believed things like this
- I used to belive that it was Illeagal to drink ANY beverage while driving, not just alcohol.— Emma*
- I always thought there was a drinking age for coffee, because it was an adult drink like beer and wine.Anon
- I used to think that if you mixed a diet drink with a regular drink, it would explode. Anon
- When I was young I refused to drink well water because I thought it came out of whales.— itodd
- I thought tonic water was toxic water and wondered why would anyone drink it if it is toxic?— Dr.Badguy
- My mum used to tell me that you couldn't drink water out of the tap from the bathroom as it was poisonous.Anon