“If God had decreed from all eternity that a certain person should die of smallpox, it would be a frightful sin to avoid and annul that decree by the trick of vaccination.” So said Timothy Dwight, president of Yale University from 1795 to 1817. He was speaking passionately against Edward Jenner’s new medical invention called vaccination. It was not then a particularly extremist view. Vaccination and inoculation, though highly successful, were denounced by many religious leaders. Today, during the pandemic, religious fundamentalists will not say that God changed His mind and no longer condemns medical interventions that can save lives. Most, but not all, will simply find interpretations of their holy book that oppose those of previous generations. It isn’t hard to do. You just focus on one particular passage and ignore a contradictory passage.
There are religious reasons to decline a vaccine, there are valid reasons to decline a vaccine, but there are no valid religious reasons to decline a vaccine. I think an adult should have maximum decision-making freedom on issues that involve him or her, alone. However, since all viruses are contagious, ethical considerations demand taking into account how declining a vaccine may affect others. This includes COVID-19, should a legitimate vaccine be found.