I've met a whole lot of adults who never really learned that God loves them. They have to go back, and learn that, way down deep in their minds and hearts. Because they skipped that important learning goal, way back when. When kids are a little older, say in kindergarten through 5th grade, there are some additional learning goals to be met. You don't want to forget about the love of God.
People spend the rest of their lives, learning more about that.
But the emphasis, or the learning goal, changes. In kindergarten through 5th grade, it's important to learn Bible stories, and to learn a little about our own tradition as Friends, and to start to learn about our neighbors. This should sound familiar, because it makes up most of what we think of as the traditional Sunday School program. We spend a lot of time, going over Bible stories, and learning about the characters, and learning how they felt and what they said. We put on plays, and do crafts, and make pictures, and all sorts of other things, in order to learn the stories well.