I just bought this book, The Lamb, for the boys and REALLY like it. I had to pass it along.
It is a great tool to help you explain the gospel to your kids at their level.
Here is a little description of it...
'The Bible's most important message is understandable at a very young age, and you can use this remarkable book to tell your children the story of God's plan of redemption from Adam and Eve to Jesus' ascension. Each chapter features beautiful illustrations along with a simple text covering central biblical teachings. You'll also find follow-up questions and answers to help you discuss what you read with your young ones. This hardcover book measures 10.5" by 8.5", and comes with a companion CD that has narration and music. Recommended for ages 5 and up."