Forbidden Fruit and Death due to Reason
And the Lord God commanded the man, saying, Of every tree of the garden thou mayest freely eat: But of the tree of the knowledge of good and evil, thou shalt not eat of it: for in the day that thou eatest thereof thou shalt surely die.— Genesis 2:16–17
Put simply, men came to regard themselves as a kind of gods. Therefore, the God would forsake men, so that men were destined to death.
Human reason is generated based on the human body. Men living while following human reason turn their eyes to material matters and worldly things rather to heavenly wisdom. Human reason is generated for men to handle material matters and worldly things in this material world. However, it is not effective in understanding heavenly meaning of material matters and worldly things.
There is no death in Heaven, since every spirit is given eternal life by the God. If a man with the material body has his spirit living in Heaven while he is living in this world, he is not afraid of death in this world, since he understands that even if his body dies in this world, his spirit goes on living in Heaven. But if the man is living in this world based on his reason, he would lose this spiritual understanding to concentrate only on material matters. As a consequence, he would come to be afraid of physical death, since he has already lost the spiritual understanding.
Therefor, when Christ Jesus came to this world 2000 years ago, people had already lost the spiritual understanding and did not believe that their spirits could live forever in Heaven if the God allowed it. That is why Christ Jesus had to teach them that those who believed in Him would live forever in Heaven even if they died in this world.
Put simply, we have to understand that heavenly wisdom takes priority over human reason. For example, laws, regulations, rules, etc. in this world is based on human reason, but we have to give priority to heavenly wisdom in some cases. Christ Jesus did not come to abolish Torah and laws, but He gave priority to heavenly wisdom.
If people rely only on human reason, Satan would interfere with work of human reason linked to material conditions, since handling of material matters and worldly things is influenced by physical desires that are vulnerable to the influence of Satan.
From another point of view, when a man loses spiritual understanding or spiritual sight, he would believe that physical death in this world is absolute and final death. So, he would do anything such as selling his soul to Satan to get rich and live happily in this world till his death, which should satisfy Satan.
Physical death in this world of a man without knowing eternal life to be given by the God in Heaven would be real death. In other words, he has chose death over life. But, those who believe in the words of Christ Jesus can be said to have chosen life over death or heavenly life over worldly death.
However, the God is merciful. If a man does not know and understand the words of Christ Jesus, he would be accepted in Heaven if he respects and fears the God and rejects Satan. It also means that those who blindly follow the Vatican and other churches might not be accepted in Heaven especially if they are rich.
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Mark 10, King James Version
18 And Jesus said unto him, Why callest thou me good? there is none good but one, that is, God.
19 Thou knowest the commandments, Do not commit adultery, Do not kill, Do not steal, Do not bear false witness, Defraud not, Honour thy father and mother.
20 And he answered and said unto him, Master, all these have I observed from my youth.
21 Then Jesus beholding him loved him, and said unto him, One thing thou lackest: go thy way, sell whatsoever thou hast, and give to the poor, and thou shalt have treasure in heaven: and come, take up the cross, and follow me.
22 And he was sad at that saying, and went away grieved: for he had great possessions.