We do, and always have. To sin is to err (to miss or fall short) and that to varying degrees can have consequences, i.e., your “suffer” etc.
What is the sin condition against humanity that no longer exists?
The condition of alienation that sin wrought no longer exists. The death of relationship that had man exiled (death) from the presence of God has been turned around and reversed in Christ, aka, the reconciliation. The gospel was/is about making that reality (of reconciliation) known to those sitting in darkness, i.e., sitting in ignorance as to this reality secured in Christ… what the first Adam lost the last Adam restored.
The condition or offense of sin that stood over and against humanity in terms of alienation from God — it is this that no longer exists…
Jn 1:29 The next day John saw Jesus coming toward him, and said, “Behold! The Lamb of God who takes away the sin of the world!
Heb 9:26 He then would have had to suffer often since the foundation of the world; but now, once at the end of the ages, He has appeared to put away the sin by the sacrifice of Himself.
The condition or offense of “the sin” (a noun not a verb) was annulled. Yes we can and do in our actions “sin” (verb) to which James advocates we confess one to another (Jas 5:16). This horizontal confession reflects the healing established in the vertical confession “it is finished” whereby the horizontal (man) met the vertical (God) in the Cross of Jesus Christ.