This series - Big Thoughts For Little Thinkers is excellent! These small little books are cute and easy to understand for young children all the while dealing with "deep" concepts.
These 4 books talk about and explain The Scripture, The Mission, The Gospel, and The Trinity at a child's level. Each book is "narrated" by a character who introduces their self to you at the beginning of the book in way that gets your child's attention.
I really enjoyed how easy it was for my kids to relate to the characters in the books and understand hard things. The book on The Gospel was my favorite, but all of them were very good and biblicaly sound. I read them to my 3, 5, & 6-year-old children and each of them were able to understand at appropriate levels.
Every home should have a set of these on their shelves!
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Thanks to New Leaf Press for the courtesy review copies.