Am I doomed to Hell if I misunderstand a verse?
That's not what dooms people to hell. I think that God gives us a lot of grace in the mistakes we make. At the end of it all I believe we have exactly one hope, and that is the truth that Jesus Christ really does save us in His death and resurrection, and living His life in us, that we can grow into becoming like Him.
When we choose to believe in that truth, to receive Jesus to ourselves, our Lord, our Life, God restores our relationship to Himself by restoring to us the spiritual life which Adam lost, and we had never known. He makes us alive spiritually, alive in a new spiritual realm, having communion with the One Who is Spirit.
Those who do not receive Him do not receive His life, and remain in what the Bible calls death. Though alive as we call it, God calls us dead in sin, separated from Himself. Jesus said that eternal life is knowing God, and knowing Jesus Christ. Relationship.
We've been restored to relationship with our Creator through Jesus, being reborn, spirit born from Spirit. Our flesh, like all flesh of those of Adam's race, is corrupted by sin. All corrupt flesh is condemned.
God judged our flesh in Christ when He died, and we were "immersed into His death", and burial, to share His new life. While we remain still in corrupt flesh, being still in this realm, to which the flesh is suited, God has promised that we will be clothed with incorruptability. The old flesh, the natural life from Adam will be gone.
That is for the one who is born again.
The one who has not been reborn remains a fleshy man born from Adam's line. Not spiritually alive, so unable to know God in a way to bring eternal life. That new life had never been created.
The judgment we through which we pass being in Christ, just as Noah was in the ark, destroys those who are not in Christ, as the flood destroyed all not in the ark.
What dooms someone to be condemned under God's judgment is that they are dead in their sin - and I saw the dead - and sinful and unrighteous dead are to be thrown in the lake of fire.
Sobering thoughts!
Much love!