Ephesians 2...as in eternal death - Lake of Fire. Not dead in heart.
1 And you hath he quickened, who were dead in trespasses and sins;
2 Wherein in time past ye walked according to the course of this world, according to the prince of the power of the air, the spirit that now worketh in the children of disobedience:
3 Among whom also we all had our conversation in times past in the lusts of our flesh, fulfilling the desires of the flesh and of the mind; and were by nature the children of wrath, even as others.
4 But God, who is rich in mercy, for his great love wherewith he loved us,
5 Even when we were dead in sins, hath quickened us together with Christ, (by grace ye are saved)
Colossians 2:13 "And you, being dead in your sins and the uncircumcision of your flesh, hath he quickened together with him, having forgiven you all trespasses"
This part . . . the uncircumcision of your flesh . . . I think this is speaking about the fact that before we are reborn, all we have is our flesh, and the mind of our flesh, and this condition is being dead, that is, disconnected from God.
We have to have the flesh "cut away", I believe this is what our rebirth is. We die with Christ, which separates us from our flesh, and rise with Him, having a new life that is not based in our bodies, but is based in His Spirit. Though we continue to be housed in our bodies.
Much love!