The theory of evolution by cumulative natural selection is the only theory we know of that is in principle capable of explaining the existence of organized complexity.
Metaphors are fine if they aid understanding, but sometimes they get in the way.
I don't know what to think about magic and fairy tales.
Complex statistically improbable things are by their nature more difficult to explain than simple statistically probable things.
If children understand that beliefs should be substantiated with evidence as opposed to tradition, authority, revelation or faith, they will automatically work out for themselves that they are atheists.