A suggestion for preparing kids to understand the concept of belief:
"Try a game called “Fact, Fiction or Belief.” [...] Make statements and have your child label them accordingly. For instance, you might say: “The moon is in the sky.” (Fact!) “You like to eat rocks.” (Fiction!) “Pink is the best of all the colors.” (Belief!)
Remember: don’t try to make things too literal or complicated or to inject actual religious beliefs into your examples...."
(Wendy Thomas Russell, "5 Ways to Talk to Your Kids About God")
Grinning Cat, an excellent idea. Thanks for the lead to Wendy Thomas Russell, "5 Ways to Talk to Your Kids About God".