I was amazed at the questions he was asking and how he also tied it in with what he has been reading in Child's History of the World and Grandpa's Box. We talked about how the Jews in the OT had to constantly make sacrifices to be forgiven for their sins and how Jesus was the ultimate sacrifice when he died on the cross for us! He asked about what happened to Adam and Eve, Moses, David and other Old Testament figures when they died since Jesus hadn't been sent by God yet, but they still believed in the true God. Wow! I wasn't asking these kinds of questions until I was much older than 9!!! 
I know I have HOD to thank for providing such awesome opportunities to have such meaningful, life-impacting talks with my children!!! THANK YOU!!!! Just had to share! P.S. I wanted to add that I am seeing an amazing amount of growth/maturity in my oldest DS compared to last year as far as the spiritual discussions go -- he used to say "I don't know."
as his standard answer...I am so encouraged that lately his answers and questions are much more thought out and heartfelt! Praying that his relationship with Jesus will continue to grow, mature, and become more personal to him!