The Garden of Eden was man's time in the wild, living off the land. Original sin was plowing the fields, building hovels, and settling down. The fruit of that tree was growing in a man-made orchard. It was the first fruit an agrarian society ever tasted.

When we die, we do not persist on some other plane. The only remnants of our soul is in our children, which is passed on from generation to generation. In this way, we have the potential to be immortal. And heaven is simple the Earth, if we can guide it to a heavenly state. And hell is also just the Earth, if we lead lives that degrade it and make it a hellish place to live.