Just a note of someone mocking a friend of mine by saying “How can you be born again before you were born? You haven’t sin yet!”
The problem with people who make comments like these is that they view the new birth and new creation as a personal event.
I humbly submit to you the new birth and new creation are corporate events. They are not individual events.
Whilst scriptures and events seem to suggest that it may amount to individual conversions such as the events in the book of Acts, it recorded what was happening through a transitory period from Law to Grace. The rippling effect, but not the ongoing reality.
However scripture clearly states that Jesus was the last Adam and everything that was of Adam died on the cross. The old humanity died. Paul himself in Galatians 2:20 said the old man was crucified with Christ on the cross.
Then Paul said this.
by setting aside in his flesh the law with its commands and regulations. His purpose was to create in himself one new humanity out of the two, thus making peace, and in one body to reconcile both of them to God through the cross, by which he put to death their hostility.
Jesus created a new humanity on the cross.
Peter said this.
1 Peter 1:3
Blessed be the God and Father of our Lord Jesus Christ! According to his great mercy, he has caused us to be born again to a living hope through the resurrection of Jesus Christ from the dead,
That the human race was born again at the resurrection of Jesus Christ.
So. The Adamic humanity died with Jesus. The new humanity born out of Christ came to being at the resurrection. What you saw in the book of Acts was the commencement of this fact.
When Paul wrote this, he was looking forward to it within his lifetime. This happen in AD70.
For the creation waits with eager longing for the revealing of the sons of God.
You can then see Paul speaking about when this would happen in this verse.
For we know that the whole creation has been groaning together in the pains of childbirth until NOW.
Referring to the time in which the time the book of Romans was written.
Hebrews records for us the same thing here.
For then must he often have suffered since the foundation of the world: but NOW once in the end of the world hath he appeared to put away sin by the sacrifice of himself.
Both Romans and Hebrews tell us that creation was ending and being born again at that generation just as Jesus promised being the after effect of the cross and resurrection.
That upon you may come all the righteous blood shed upon the earth, from the blood of righteous Abel unto the blood of Zacharias son of Barachias, whom ye slew between the temple and the altar. Verily I say unto you, All these things shall come upon this generation.
So you see, you are not born again via your decision. It was never an individual affair. It was about the whole human race. All of us were placed in Christ at the death burial and resurrection of Jesus.
Whether you believe or you don’t doesn’t nullify this reality.
You were born again when Jesus became the first born from the dead.
And if the Spirit of him who raised Jesus from the dead is living in you, he who raised Christ from the dead will also give life to your mortal bodies because of his Spirit who lives in you.
That’s how humanity was given lives even when they were dead.