The way to look at is, NOT that the death itself forgives sin, only God can do that. He is the final authority, whose law was broken.
Why Not says:
Jesus death forgives sins yet the Bible also says our death forgives our sins. So, which is it?
Myeleine says it best above:
Does our death ever cancel our sin debt? No. We are not perfect nor was our death a sacrifice.
Our death cannot be a sacrifice since we are going to die anyway. It would be like giving you a car as a gift after a mechanic has just told me that the engine block is cracked and it will completely die within 1000 miles. It is no value to the giver and is actually an offence to the receiver.
The WT promoted the heresy of a person being able to atone for oneself through a twisting of a scripture in Romans Chapter 6
KJV:
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.
7 For he that is dead is freed from sin.
8 Now if we be dead with Christ, we believe that we shall also live with him:
9 Knowing that Christ being raised from the dead dieth no more; death hath no more dominion over him.
When a person accepts God's offer of pardon he is freed from the domination of sin in this life because he has a new spirit. Jesus spoke of this condition as being "born again".
But, the WT bible states that a person who has died is acquitted of sin. Not only is this a spiritual death, and as such does not apply the way the WT uses it as self-atonement, it is not an acquittal at all... but a freedom from sin. At first the impetus to sin is totally removed from the spirit when it is renewed at the moment a person trusts Jesus alone (without or apart from religion); Later, at the resurrection, the body is glorified and has no impetus to sin.
But no where does the NT claim that a person can atone for their own sin..."else Christ died for nothing.".
If a person does not accept Jesus sacrifice death as a substitute for their own by faith, they will have no justification for life at Judgement Day after they die.
What we do with Jesus in this life determines where we will spend eternity since the soul will be conscious for eternity. The eternal soul (mind) is a tremendous gift God has given us. But, it has the potential to be our greatest nightmare since it cannot be shut down at will.