Adam lived to be 930 years old. What died the day he ate from the tree of knowledge of good and evil? We know it wasn’t his body because if it had, we wouldn’t be here. His soul didn’t go immediately to Sheol, so it wasn’t his soul. Adam breathing, eating, and procreating after he ate the forbidden fruit is evidence that death is not a cessation of existence; it is a change of state. The Adam on the other side of sin was not the same as the Adam before. His spirit was dead. As his children, we were born spiritually dead.
Anyone who purports that the dead experience no intermediate conscious state prior to physical resurrection must deal with the declaration of Jesus that the dead hear, speak, and can experience comfort or misery. Jesus referred to death as sleeping. The correlation is deeper than mere idiom. God created the natural order to teach us about Himself and the spiritual order.