For the longest time I thought Catholic and Christian were the exact same thing.
I grew up southern Baptist and was somewhat astonished to learn that as a Baptist, I was also considered a Protestant. I had heard the word before, but got it confused with Presbyterian. Not being a Presbyterian I simply didn't think about it.
(I'm pagan now, btw, lol.) - Although I did make a point to go about my day wearing orange last St. Patrick's day... Yeah, I'm a dork.
A childhood belief about church

others believed things like this
- That you start out Catholic and after you reach a certain age you then become Protestant.Anon
- I thought "Orange is the New Black" was about wearing orange to funerals.Anon
- I thought that when I grew up I HAD to start wearing polyester like my mom.— levi lady
- When I was young, I heard the word 'minion' for the first time and thought it was a miniature onion.— Karin
- I used to think God and Jesus were the same person. And I grew up Catholic.— Jackie Mullinix/st louis
- In first grade, I thought that if I've never heard of a word before, then it wasn't a word.— Destiny