Well, I'm Catholic, and I went to a private school. On Ash Wednesday, when the priest rubs some ashes on your forehead at church at the beginning of Lent, I used to think the ashes were like still on fire and burning, and that it would burn into your forehead and skull permanently and hurt. I think I was around 5 or 6, and I remember running out of the church when it was my turn to be next in line.
One a side note I also thought most people in the world were one religion.
A childhood belief about church

others believed things like this
- I used to believe that if I got my hair cut like Farrah Fawcett's people would throw ashes on me.— mel
- I used to think that the priest at church was JESUS.
He had a beard.... it made sense— Joe B - I used to believe the local Catholic church was Disney Land.— Sherri
- I used 2 beleive yer @$$ was yer foreheadAnon
- I used to believe that the wrinkles on my dad's forehead were his feelings.— Suzy
- I used to think my forehead was actually called a three-head.— Fen