You wanted me to note the difference in Catholic vs Orthodox teaching on the inheritance. If I saw a difference I would do that. The phrase “inheritance of original sin” means the effects of original sin, which are death and lack of sanctifying grace (not personal guilt or actual sin). The mode of transmission is through human generation, the same as stated by Saint Cyril of Alexandria:
“'The imparting of Original Sin by means of natural heredity should be understood in terms of the unity of the entire human nature, and of the
homoousiotitos of all men, who, connected by nature, constitute one mystic whole…”
John Karmiris, A Synopsis of the Dogmatic Theology of the Orthodox Catholic Church, trans. from the Greek by the Reverend George Dimopoulos (Scranton, Pa.: Christian Orthodox Edition, 1973), p. 36
You said: “The fragmented quote of St. Athanasios doesn’t refer to “a mystery” at all.”
I am saying that the idea of the incarnation is what the Catholic Catechism is referring to as what is mysterious, in that we do not
fully comprenend it. However, it is partially comprehended and expounded by Athanasios and in the Catechism.
I must not have been clear in my statement, because you did not read it the way I meant it, so I will rephrase it.
Instead of “First I want to say that I personally do not conceive of what results from sin as a punishment.”
It should have read as:
“First I want to say that I personally do not consider the results of sin to be a punishment.”
You said: “The more I read about Catholic teaching, the more I know that it seems fractured and the fractured parts are in contradiction with themselves.”
I can see how that can happen. This can happen if one does not understand the theological terminology, which differs from standard dictionary. It can also happen if you read opinions that were written in different eras and try to paste them together, such as St. Thomas or Aquinas and St. Augustine, each with their own different viewpoint. If you want to understand the teaching of the Catholic Church, then read the Catechism of the Catholic Church and the references that it makes. Just as in Orthodoxy, there are many opinions but not all are considered a matter of faith, rather just opinions.
The dogmas of faith (de fide) about original sin are very few, which I summarize below, but not from the Catholic Catechism, rather from an older document by Catholic theologian Ludwig Ott (1906-1985).
Our first parents, before the Fall, were endowed with sanctifying grace and bodily immortality. They sinned grievously through transgression of the Divine probationary commandment and through that sin, lost sanctifying grace and became subject to death and to the dominion of the Devil. The state of Adam’s original sin is transmitted to his posterity, not by imitation, but by descent through natural generation whereby man is deprived of sanctifying grace and all that this implies, as well as of the preternatural gifts of integrity (i.e., bodily immortality). Souls who depart this life in the state of original sin are excluded from the Beatific Vision of God.
I could assemble a list from the latest Catechism of 8 September 1997 which would be official. You can read it here.
usccb.org/catechism/
Compendium:
vatican.va/archive/compendium_ccc/documents/archive_2005_compendium-ccc_en.html