Yeah, I’m not sure how I feel about the present-day Catholic teaching. I feel pretty strongly against how Augustine framed the matter towards the end of his life, which I don’t see much difference between his views on Original Sin and John Calvin’s views. If I wind up abandoning this thought experiment, which I first began here, I would most likely fall back on the way that John Cassian framed it, who most Orthodox tend to agree with a lot on the matter.
Calvin is different than St. Augustine: Calvin did not necessarily associate concupiscence with sexual desire, it is for him, a synonym for sin.
In a declaration regarding justification (and the Lutheran concept) the Catholic Church states:1. The major difficulties preventing an affirmation of total consensus between the parties on the theme of Justification arise in paragraph 4.4 The Justified as Sinner (nn. 28-1,0 ). Even taking into account the differences, legitimate in themselves, that come from different theological approaches to the content of faith, from a Catholic point of view the title is already a cause of perplexity. According, indeed, to the doctrine of the Catholic Church, in baptism everything that is really sin is taken away, and so, in those who are born anew there is nothing that is hateful to God (3). It follows that the concupiscence that remains in the baptised is not, properly speaking, sin. For Catholics, therefore, the formula “at the same time righteous and sinner”, as it is explained at the beginning of n. 29 (“Believers are totally righteous, in that God forgives their sins through Word and Sacrament …Looking at themselves … however, they recognize that they remain also totally sinners. Sin still lives in them…”), is not acceptable.
vatican.va/roman_curia/pontifical_councils/chrstuni/documents/rc_pc_chrstuni_doc_01081998_off-answer-catholic_en.html
Once again the decree from the Council of Trent:This concupiscence, which the apostle sometimes calls sin, the holy Synod declares that the Catholic Church has never understood it to be called sin, as being truly and properly sin in those born again, but because it is of sin, and inclines to sin.
Haydock Commentary on Romans 7:14
14 For we know that the law is spiritual; but I am carnal, sold under sin.
Ver. 14. I am carnal, sold under sin, a slave subject to sinful inclinations, which are only properly sins when they are consented to by our free-will. There has been a great dispute both among the ancient and later interpreters, whether St. Paul from this verse to the end of the chapter speaks of a person remaining in sin, either under the law of nature or of the written law, (which was once the opinion of St. Augustine) or whether he speaks of a person regenerated by baptism, and in the state of grace in the new law, and even of himself when he was a faithful servant of God. This is the opinion of St. Augustine in many of his later writings against the Pelagians, for which he also cites St. Hilary, St. Gregory of Nazianzus, and St. Ambrose. It is also the opinion of St. Jerome, (Ep. ad Eustochium de custod. Virg.) of St. Gregory the great, of Ven. Bede, and the more approved opinion, according to which the apostle here by sin does not understand that which is properly speaking a sin, or sinful, but only speaks of sin improperly such, that is of a corrupt inclination, of a rebellious nature corrupted by original sin, of a strife betwixt the spirit and the flesh, which remains for a trial in the most virtuous persons: of which see again St. Paul, Galatians v. 17. We may take notice that the apostle before spoke of what he was and what he had been, but now speaks in the present time of what he is, and what he doth. (Witham) — The law is styled spiritual: 1st, because it prescribes what appertains to the spirit, and to the spiritual man: i.e. to follow virtue and shun vice: 2nd, because it directs man to the worship of God, which is spirit and truth: 3rd, because it cannot be fulfilled by spiritual men, unless by spirit and grace: 4th, because it directs the spirit of man and disposes him properly towards God, towards his neighbour, and towards himself: and lastly, because the law spiritually received and understood, leads and prepares men for the evangelical law, which is the law of grace and spirit. (Menochius)