The gift of life goes back to God. The soul simply ceases to exist. It is like turning off the light. Neither to heaven or hell, it simply ceases to exist any longer. If we understand where Adam came from we will have a much easier time understanding what happens when we die and life ceases.
Genesis is very important, it's vital.
We will never know how God made Adam. Suppose you were going to make a human body. It is so complex. Suppose you were to make a piece of skin the size of a small postage stamp. Let's say that's your job description.