Why does every person have to die if the body is under the curse?
Because the body is the old Adam, and the flesh came under the curse through sin. Death entered as part of the fall of man, so all men have to die. Every person dies unless the Lord returns to translate them.
Les teaches that in Romans 8:10, if Christ be in you, the body—the old Adam again—is dead because of sin. Adam and the flesh were all under the curse. He explains this body is going to die if the Lord doesn't come to translate us, and it is all part of the fall of man. Death came in, and so all men have to die. He also connects this to the mystery revealed in Paul's epistles: Christ in you, the hope of glory.
And if Christ be in you, the body is dead because of sin; but the Spirit is life because of righteousness.
More Questions
What does it mean that the body is dead because of sin in Romans 8:10?
In Romans 8:10, the body that is 'dead because of sin' refers to the old Adam, and Adam and the flesh were all under the curse, so this body will die unless the Lord comes to translate us.