Hi Iraneus,
The Watchtower has put forth huge elaborate schemes for one sole purpose in my opinion: To make the offer of an exchanged life unavailable to the JW member.
They do this by:
1. Teaching that Jesus died for Adam's loss...not yours.... Even though everyone will be judged individually AFTER they die (Heb. 9:27)
2. A person can atone for their own sin just by dying.
3. You cannot be Justified in this life, that's only for the 144K
4. Jehovah is not your father, only your potential father.
5. Jesus is not your Mediator
The WT 's illogical massive effort to keep people from receiving a "free gift" was one of the major things that got me to thinking: what was it that they were trying so dang hard to hide?
I am glad that I am not longer held prisoner by the idea that I cannot have EVERYTHING the scriptures say that I can have.
The scripture you cite in Duet. is absolutely true. But notice how Romans ch. 6 deals with this for the Christian believer:
Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life.
For if we have been planted together in the likeness of his death, we shall be also in the likeness of his resurrection: Knowing this, that our old man is crucified with him, that the body of sin might be destroyed, that henceforth we should not serve sin.
For he that is dead is freed from sin. [not acquitted like the NWT reads]
Now if we be dead with Christ, we believe that we shall also live with him:
Knowing that Christ being raised from the dead dieth no more;
death hath no more dominion over him.
For in that he died, he died unto sin once: but in that he liveth, he liveth unto God. Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord.
The Christian receives a new spirit the moment he trusts Christ as his ONLY savior and Lord... apart from any religion or organization. His old spirit "dies" and he receives an incorruptible spirit as a down payment for when he is totally saved in spirit, soul & body at the resurrection (or rapture whichever comes first).
The works of the "old man" to try and pay for something, however well intentioned are unacceptable, and even deeply offensive to God after Calvary. The life of a Christian is an exchanged life , "Yet not I, but Christ who lives in me". Gal. 2:20
...The ultimate "Prince & the Pauper" scenario.
Hope this helps.