Apologia?  I know, Apologia is known for their science curriculum, but I think they should equally be known for their Bible curriculum too.  They have a series of Bible curriculums for 4th - 8th graders (and you can run this with younger kids too!)  

The books in this series are:
- Who is God
- Who am I
- Who is my Neighbor 
- What on Earth can I Do

These books are written in a very "Apologia text book" fashion.  Very easy to open and use with no prep work before hand.  The character building in this curriculum is so wonderful and I can see how my children grew as we went through these books. 

Click here to learn more about Apologia.