I'll let
@JonC speak for himself and clarify, but i believe this is the gist of what he is saying
Adam was born with flesh, Soul, spirit--one that was not "Spiritual". It was not "union-ized" With Christ.
Because Adam sinned, Judgment came upon all the world. One of those Judgments was death, Physical death. A separation of one's body from their soul and spirit.
Adam was never "infused" with the Presence of God. So, we share the same condition as Adam, "dead" in our trespasses and sins. We are separated from the Presence of God--meaning we are not Spiritual. And because Adam took on shame and guilt, we too bear the shame and guilt of Adam's sin. That's why death has passed on from Adam to Moses without the law.
What happens to those who remain "Spiritually dead" or "Not Alive-in-Christ"? They go to the lake of fire, the second death.
It is appointed to men once to die, and then the judgment. All die Physically, but only those who are not Spiritually alive will die the second death--the lake of fire.
Those who are Christ's, are made alive and Receive His Life. The Only Life there is.
In Adam, God shows us that there is no life apart from Life with God.