
Cameron B. answered 05/10/21
Instructor of History, Religion, and Classics
Well, part of your question is somewhat a "begging the question," in that, you assume a certain Biblical interpretation. Your reference to the Cain and Abel saga in Genesis 4 seems to imply that you believe the death of humans is 1) as a consequence of Cain killing Abel, specifically the spilling of his blood into the earth (Gen. 4:10); 2) that a person's death is related to one's "exposure to the world." There are problems with both these assumptions.
First, unlike what has been popularly taught, humans were not created inherently immortal. It would seem rom the Fall narrative of Gen. 2-3, that human's immortality was dependent upon their being able to eat the fruit from the Tree of Life. This implies that immortality was not inherent in humanity. Thus, God's casting out of mankind from the Garden of Eden, thereby removing their ability to eat of the Tree of Life, means that they will no longer have the option to be immortal.
From the first rebuttal, it is possible to see how the second assumption doesn't really make sense. Since humans were not and are not inherently immortal beings, then exposure to the world has nothing to do with their ability to die in the world. Rather, their ability to die is inherent in them, and we can assume that the death of unborn humans is simply a consequence of a fallen world.
Hopefully this answer helps in addressing your question as well as adjusting an interpretation of the Fall.
~Cameron Brock