Satan or the Angel of Death
According to classification by the International Committee on Taxonomy of Viruses (ICTV), there are about 30,000 types of viruses.
There are about 650 types of viruses that infect the mammals and birds. The National Institutes of Health reported, 20 years ago, that an average American was thought to be infected with a virus 200 times in his or her life. In history, the mankind have suffered various virus infectious diseases, among which the most notable ones are small pox and rabies. Small pox is believed to have first started to spread when agriculture was started in Mesopotamia abut 9,000 years ago.
It was in 1935 that a virus was first crystallized and visualized through an electronic microscope by Wendell Meredith Stanley, an American virologist. At the time viruses were thought to be living things, it was a big surprise that viruses could be crystallized. Indeed, some people today still think that viruses are non-living material.
For example, computer viruses are codes or a kind of computer programs. But as they infect other codes to function, they don't work without other codes. Likewise, viruses in the nature need other living things to reproduce themselves.
Because human beings have become so bad and evil as to create computer viruses in large quantity, it is no wonder that the Angel of Death would use biological viruses, which have been existent since the beginning of the human culture, to exterminate the mankind, if the God ordered the Angel to do so.
Satan must want the mankind to further survive and prosper doing every bad thing as servants of Satan. So, Satan should not exterminate the mankind at this point of history. But the God, observing every bad thing made by men, might really want to put an end to the history of the mankind at this point by using the Angel of Death.
However, the benevolent God would give full warning to the mankind. And, this corona-virus pandemic must be such warning. If we repent enough to appease the wrath of the God, the world will be restored to the normal state before long.
Anyway, if most of people have become servants of Satan, selling their souls to it to become rich and continuing to love money and wealth, there must be no reason for the God to protect the mankind from, say, viruses.
So, I have to refer to the Bible, as a member of the mortal mankind, to be guided by holy words only to find: "This, then, is my condition: on my own I can serve God's law only with my mind, while my human nature serves the law of sin."
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Matthew 4
10 Then saith Jesus unto him, Get thee hence, Satan: for it is written, Thou shalt worship the Lord thy God, and him only shalt thou serve.
11 Then the devil leaveth him, and, behold, angels came and ministered unto him.