Why are all people spiritually dead and called children of Adam?
Because Adam fell, his fallen nature was passed to every human being, making all people members of Adam’s family and a fallen race. The text says that if one died for all, then all were dead, confirming universal spiritual death inherited from Adam. This is why every person is called a child of Adam and is spiritually dead.
Les teaches that when Adam fell, the Adamic nature was inherited by every human being, so everyone who has come into the human family is a child of Adam and part of a fallen race. He points to 2 Corinthians 5:14, where the emphasis is that if one died for all, then all were dead, showing that all people are spiritually dead. This is why the gospel has gone to the whole world, and why faith must be in the crucified and resurrected Christ, not merely the Jesus of Nazareth of His earthly ministry.
For the love of Christ constraineth us; because we thus judge, that if one died for all, then were all dead:
Are people in the world around us spiritually dead?
Yes. Scripture indicates that people around us are spiritually dead. II Corinthians 5:14–15 reasons that if one died for all, then all were dead. The context applies this to living in a world full of spiritually dead people. Ephesians 2 is then cited as the supporting passage.
Why is every human being a child of Adam and spiritually dead?
Every human being is a child of Adam because when Adam fell, the entire human race inherited his fallen Adamic nature. Since all people come into the human family through Adam, they share his fallen condition and are spiritually dead. This is why the verse declares that if one died for all, then all were dead.