I urge all to use a bible that doesn't advocate false doctrines.
But we are ALWAYS "in Christ"...after our "immersion" into Him.
There is no sin "in Christ".
So those "in Christ" also have no sin in them.
Our sanctification is completed when His blood is applied while we are cleansed of all past sins. (Heb 10:10, 14)
The only thing "gradual" in the life of a Christian is our growth in grace and knowledge.
So --you're a KJV onlyist?!
And what false doctrines does the NKJV advocate? Or the ESV?
How are we 'immersed' into Him / Christ?
Christ was Not born with a sin nature -- we were. We have the propensity For sin, Christ does not.
That is what progressive sanctification Is / Means -- the gradual growth in our grace and knowledge of Jesus Christ. Growing to be more like Christ. Our accepting Jesus Christ as personal Savior Does take place -- a one-time 'happening'. We start out our spiritual life as babes in Christ and through Bible reading / talking to God through Jesus Christ -- we 'grow' spiritually. Our desire will be to become more and more like Him. But we won't be completely In Him until we are With Him for eternity.