Rachi, GS9(then 5) had a very deep understanding of what we believe as Christians. Go to your pastor, or a parent you respect in your church, and talk to them about ways to address your childs concerns. Don't let them blow you off because your child is young to be considering these things, if they are dwelling on it then they need answers to their questions.

I will say Kriston had a good story, so be sure you understand what your child is asking.