The Roman Catholic Church continues to reject the imputation of the righteousness of Christ to the sinner. According to Rome, our righteousness before God is not the objective, alien righteousness of Christ but our own inherent, personal, subjective righteousness which, beginning with Baptism, develops over our lifetime. This righteousness and holiness is perfected in Purgatory. The Church gives the name Purgatory to this final purification of the elect. The difference between the Roman Catholic and the Protestant understanding of justification is directly related to different understandings of the human sinful condition.
All biblical truth fits together.
If you get sin wrong, you will also get justification wrong. Otherwise he will give him poison instead of medicine. This medicine serves to fight it. If he does not know what is amiss, he will give a bad remedy. The Roman Catholic Church diagnoses the human condition as being wounded or injured.