Wherefore, as by one man sin entered into the world, and death by sin; and so death passed upon all men, for that all have sinned: For until the law sin was in the world: but sin is not imputed when there is no law. Nevertheless death reigned from Adam to Moses Romans 5:12
Moses came on the scene many hundreds of years after Adam. In all that time, God was not holding men's sin against them. NEVER THE LESS - DEATH REIGNED. When we learn that sin is not the problem, it has been forever dealt with by Jesus. The problem is not sin, the problem is death. The answer is not avoiding sin, the answer lies with the author of Life, Jesus.