I plan on taking almost the exact same route with my kid. If he asks, I will tell him that many people believe different things, and if he asks what I believe, I will tell him that I think nothing happens. I think the most important thing is to make sure you don't teach anything as a dogmatic truth and let the child come to their own conclusion.
Even if the open windows of science at first make us shiver after the cozy indoor warmth of traditional humanizing myths, in the end the fresh air brings vigor, and the great spaces have a splendor of their own - Bertrand Russell