Do you think people were originally meant to be immortal?
People were created with the Freewill to live or die,to sin or to obey God.
We know through schripture Christ was the Lamb that was slain before the foundation of the world.
Even though God gave us freewill He knew man could not remain obedient forever.
There are two people that I know of that never encountered death on earth,one was Enoch and the other Elijah.
We're they sinless ?
I doubt it because Jesus Christ was the only man to remain sinless,for our sake God became flesh.
Free will allowed sin into the World,if man was not given Freewill and only performed God's will ,then man would not have been made in the image of God.
After the fall and Adam and Eve took from the tree of knowledge God placed gaurds on the entrance to the Garden.
If after they were enlightened by knowledge, they would have eaten of the tree of life this would have made them immortals and like God's.
The Bible uses the term as God's.
As Christians we are immortal we only die in body not our Spirit.
Our time on this earth is short, not even a dot compared to our future in God's kingdom.
We are not temporal beings we are eternal by design.
We can refuse God's grace and die,satan and a third of the beings in Heaven did just that.
God gave us purpose by giving us freewill,our purpose is to accept his plan for salvation.
Salvation is God's will for all mankind ,but some will suffer eternal seperation from God due to their hardened hearts.
We would never know the gift and goodness of God if we were not given a choice to live or die.
Satan's purpose is to steal kill and destroy,but only for a season,then he will be destroyed himself.
How would we ever know right from wrong if not given a choice?
Yet our mistakes are forgiven through Christ.
Satan has no choice and will be cast into the lake of fire.
Why you may ask ?
Satan knew God our Father the Alpha and Omega face to face ,much more than man and he chose to rebel he is with out excuse.