Why would it be a sin? A sin is something that opposes God and His righteous will. How would taking a vaccine oppose God?
The vaccine helps people to fight a virus. That virus has already killed between 3 million to 6 million people worldwide. The vaccine is like a medicine.
The Bible encourages people to care for their health. Remember, God provided many of the Laws in the Law Covenant to help keep His children healthy. For example, if a person had leprosy, they were quarantined from the rest of the nation so that the disease would not spread. Leviticus 13:14, “…the priest shall shut up the diseased person for seven days”. (Read Leviticus 13 and 14 for all the laws to protect the nation from the spread of leprosy.)
Mankind is blessed to have knowledge that helps us make vaccines. Daniel 12:4 (RSV), teaches that in “the time of the end. . . knowledge shall increase.” Medical advances due to the increase of knowledge have lessened our suffering. This is a great blessing from God – not a sin.
Without the COVID-19 vaccine, many more people will die. For example, when the Black Death spread through parts of Africa, Europe, and Asia from 1346 to 1353, it caused the death of 75 million to 200 million people. There was no vaccine. It killed at least 30% and up to 60% of the European population. Seven years of suffering with millions dying. What a terrible plague.
The COVID-19 vaccine can reduce mankind’s suffering and death. While it is not a perfect solution, it is still a blessing.