Who are those who it is impossible to renew again to repentance for they would again crucify the Son of God?
You cannot get born again the second time.
The first time is eternal.
Which sin did Jesus Christ not pay for?
Are you a witness of Jesus Christ being crucified again?
Have met anyone who has witnessed Jesus Christ being crucified again?
Have you any knowledge whatsoever of Jesus Christ being crucified again?
Where do these crucifixions take place?
Why are there no witnesses of these repeated crucifixions?
Maybe because it is not a literal fact, but a figure of speech.
Getting born again gave you remission of sins, that is all the sins that you did before you were saved.
To maintain our fellowship, (not sonship for our sonship is eternal) we must do as I John instructs. I John is about fellowship with fellow believers, God and His son Jesus Christ. See I John 1:3
To obtain the cleansing we all need at times after we receive salvation we must confess our sins to God, He is faithful and just to forgive our sins. I John 1:9
To maintain our fellowship we must go to God for forgiveness
Our previous sins were remitted, now it is up to us to keep ourselves clean.
We do not get born again again to get cleansed.
We get born again once then it is up to us to keep our fellowship we cannot get born again again for that would be like Jesus dying for us again.
Our sins our cleansed as we confess them