There's something about sharing the Gospel that can be scary. I understand that. But please don't give the "I don't know what to say" excuse.
This weekend, as we traveled up to see part of my family, Jonathan (age 4) told us that he "wanted to tell Grandma Skelly about Jesus."
So when we got there, he went to her and told her the following:
I want to tell you about Jesus. The bad people put him up on a cross. And they put nails in his feet and in his hands to keep him there. And he died. But then he came back alive!
I asked him where Jesus is now.
He responded: He lives in heaven, but he is in my heart.
A four year old gave a clear Gospel presentation. I think you can, too.