I used to think that the old folk hymn "Do, Lord" (do, Lord, oh do, Lord, oh do remember me...) was about a fairy called the "Dew Lord", and I couldn't figure out why he and Jesus were in the same song...
A childhood belief about hymns

others believed things like this
- I used to have to say the Lord's prayer everyday, but I would wonder where my daily bread was.— caledonia
- When I was learning the Lord's Prayer, I used to say, "Our Father, who does art in heaven...."— Karen
I used to believe that the Lord's Prayer instructed us to lead a snot into temptation. — Susan- "Hail Mary, full of grapes, the lord is a tree"— reenie
- I used to htink that the Lord's prayer went "and lead us not into temptation, but deliver us some email..."— Dyth
- I used to believe that in the Christian Prayer of the Faithful, we were responding, "Lord, harrow prayer."— Smelleanor