I've been really really good with all of the little questions up to this point, but this one stumped me. I couldn't find a good way to explain it. Any ideas? Well, God has always been here wasn't good enough.
For your troubles, I did this with him over the weekend and it was pretty cool. If you are looking for a neat way to explain sin and baptism I did this... I took a dry erase board and wrote "sin" on it with water soluble markers. Then I said what is sin? I then wrote things like hitting, getting mad, stealing, disobeying, taking things that are yours, etc, etc. Then we went outside with the board and I got the water hose. I asked him if he remembered the baptism from earlier in the day. He said yes. And I said, you remember what happens in baptism? He said yes, go forgives me. Then I said feel this water. Now watch what happens to these sins. They were washed off the board and it became clean again. I said, that's what God sees when he looks at you. He said "cool" and went back inside.