Artificial Robotized Men after the Mankind
Viruses invade human cells to multiply themselves there and get out of the cells, destroying them.
However, cells do not have a mechanism in them to attack and destroy viruses. Cells have evolved by taking some external microbes, such as mitochondria, into them. DNAs in a human cell include some parts originated in such microbes. So, there is a mechanism for some microbes to enter into cells. But, the mankind may introduce another mechanism in cells to attack and destroy viruses.
DNAs have the function to create various types of proteins. Usually, such proteins give features to a cell needed to form a certain organ, such as a heart and a skin, in the body. But proteins harmful to viruses may be able to be built based on certain DNAs. If such DNAs are introduced as genes, a man will have an effective means to fight against viruses.
Advanced gene engineering might be able to create a special gene on DNAs that will create proteins to attack and destroy viruses that invaded a cell. But it will be difficult to assure that such proteins do not have any other negative effects on human cells.
Like this example, the mankind will probably have the ability to create any desired genes on DNAs. But, the nature is more complex than the mankind think them to be. There must be more hidden adverse effects if the mankind become able to handle and work on cells and genes. The balance in the human body established through biological evolution for billions of years should not be easily changed for biological safety.
In long future, the mankind will give up application of gene engineering and adopt artificial robotized bodies that can be almost completely controlled by the mankind themselves. In this case, the last problem is the brain. It is said that life-span of human cells is 125 years, which means that human being cannot live longer than 125 years. So, the brain of a robotized man with natural human cells cannot live longer than 125 years. Therefore, ultimately, the mankind will create an artificial brain with artificial brain cells and nerves to acquire semipermanent life.
But when the mankind crate such artificial brains, if they do not have sincere faith and a sound sense of ethics and religion, they will not try to implant respect to the God in the artificial brains. If so, the artificial men will leave the spiritual tradition of the natural mankind. They cannot regarded as members of the mankind anymore. Whether this transition from natural men to artificial men is slow or rapid, the earth will be eventually ruled by artificial men that are different species from natural homo sapiens.
For example, 2,000 years later, a history book for artificial men might read: mortal human beings all died out due to special viruses in the 21st century but artificial robots, which they called us, took over the world through technological evolution for 2,000 years.
As artificial men, namely robots, do not die, they will not need religion, the concept of the God, and even the spiritual world. However, there is no assurance that artificial men love peace and prosperity more than homo sapiens. They may destroy the world with themselves as it is unthinkable that robots will be afraid of death and they will respect the God that did not create them.
The meaning of the word of Christ Jesus that those who believe in Him will gain eternal life (even if killed by viruses) should be reviewed in this context.
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John 7 King James Version (KJV)
3 His brethren therefore said unto him, Depart hence, and go into Judaea, that thy disciples also may see the works that thou doest.
4 For there is no man that doeth any thing in secret, and he himself seeketh to be known openly. If thou do these things, shew thyself to the world.
5 For neither did his brethren believe in him.
6 Then Jesus said unto them, My time is not yet come: but your time is alway ready.