I would definitely recommend the Case for Christ, Case for Faith, and Case for the Creator FOR KIDS! I got this series for my 9 year old son to help me with teaching him a biblical world view. Our public school system and media is so full of contradictory information, I want my son to rest firmly on the TRUTH! So I decided to find something he could read that would be on his level… We have started A Case for Christ together and he really seems to be enjoying it.
If you are looking for other items to teach biblical world view, I also recommend The Answers Book For Kids Vol 1, 2 ,3, and 4. which has answers to 88 of their most difficult questions regarding the Bible, God, sin, dinosaurs, the Flood of Noah, salvation, and more!