I realized why Kimberlee feels attacked and upset, and why she has probably left the thread.
Jesus fulfills two important emotional needs for her. She feels loved, all the time, by the most important person in the world, and she believes she is not afraid of dying, because Jesus will give her eternal life.
When you say there is no God, you're telling her that she is not loved, at least not by Jesus, and she is going to die. Those ideas are very upsetting to her.
It's not abstract; it's personal and emotional.