Unbelieving

Last night, before heading out to Awana with the family, I sat with Brice to review his booklet, the one he has to complete before getting his Awana handbook. Yes, we're behind, for anyone familiar with Awana. This should not come as a surprise to anyone.
As I read with him about the gift of salvation that comes from Jesus, I noticed Brice paying extra attention. Almost struggling to understand. I read to him, in children's words, with little kid illustrations, how Jesus died to save us from our own sin, which we could never pay for. And that He was crucified and then rose from the dead. Brice turned his head sideways. Looked at me, back at the booklet, then up at me again. Finally he got up and walked across the room. He turned around and said "Yeah, I don't really believe that, Mom."
As my sister Katie said, Well, Brice, You might want to start believing.
So, what do you do with an unbelieving five year old? How do you make him believe without using scare tactics? Advice, anyone?