The important point being, if you can't demonstrate that you are righteous in Christ then you have either never received a declaration of righteousness from God, or, for whatever the reason, you're not walking in the righteousness you have received.
What if I told you Justification is more than a declaration of righteousness?
I don't believe God plays Let's Pretend with us.
For the one dying as been justified away from the sin.
Something to notice here is that "has been justified" is the Perfect Tense, Passive Voice. We died, but justification is done to us. And this justification moves us away from sin, the direction of the preposition.
Righteoused away from sin, would be a literal way to say this.
And of course, this is frequently translated, freed from sin, that's what it does.
Later in the chapter, Paul uses another word for our freedom. Freed from sin, and enslaved to righteousness.
Romans 6:6-11
6) 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.
10) For in that he died, he died unto sin once: but in that he liveth, he liveth unto God.
11)
Likewise reckon ye also yourselves to be dead indeed unto sin, but alive unto God through Jesus Christ our Lord.
We have been brought from death, through His death, into life, through His life.
Now we are dead to sin, and alive unto God, and, the most important part, I think, Through Jesus Christ our Lord.
We are not alive unto God by any merit or mindset, or behavior or anything. We are alive unto God through Jesus alone.
In Jesus' righteousness, we are separated from our sin, the stain of sin, the guilt of sin, the desire for sin, the power of sin. His righteousness, our freedom. In Him we live.
Again I have to ask you . . . demonstate to whom? God knows those who are His. I know He lives in me. What are we doing?
If someone doesn't have God living in them, trying to prove something by behavior is IMO worse than useless. And if someone does, stop looking at you sin, and start looking at Jesus.
Much love!