I love the KJV. It’s just not religious if it’s not in Elizabethan English!

If you are just looking for the allusions, you could also skip the charm and go straight for a kids’ Bible stories book. The Jehovah’s Witnesses has one with pretty illustrations and good readability. I assume other sects do as well. (I read the KJV myself, but I had a sister who was bent on conversion…she lives with the disappointment).