Curse of Sin Brought Death

I say it is unfair for humanity as a whole to suffer physical death based on the disobedience of Adam and Eve in the Garden of Eden. God knew that Adam and Eve would disobey Him by eating of the tree of the knowledge of good and evil. This act alone brought to the world the curse of sin and through sin spiritual separation from God that led to physical death. Of course, this is the Christian explanation for death and dying. All religions have an explanation for death, dying, and the afterlife. The question remains: WHO IS RIGHT?