How fun! This just fell into my lap!
37. When, however, there is question of another conjectural opinion, namely polygenism, the children of the Church by no means enjoy such liberty. For the faithful cannot embrace that opinion which maintains either that after Adam there existed on this earth true men who did not take their origin through natural generation from him as from the first parent of all or that Adam represents a certain number of first parents. Now it is in no way apparent how such an opinion can be reconciled with that which the sources of revealed truth and the documents of the Teaching Authority of the Church propose with regard to original sin, which proceeds from a sin actually committed by an individual Adam and which through generation is passed on to all and is in everyone as his own.
(For an extra bonus, here's #40
40. Truly, we are aware that the majority of Catholic doctors, the fruit of whose studies is being gathered in universities, in seminaries and in the colleges of religious, are far removed from those errors which today, whether through a desire of novelty or through a certain immoderate zeal for the apostolate, are being spread either openly or covertly. But we know also that such new opinions can entice the incautious; and therefore we prefer to withstand the very beginnings rather than to administer the medicine after the disease has grown inveterate.
Too late, Pope Pius XII. The incautious have already been enticed by the inveterate disease.)
And here, from the most recent Catechism (of all the material! It's the almost-modernist Catechism of the 20th Century that attests to the first parents!)
374 The first man was not only created good, but was also established in friendship with his Creator and in harmony with himself and with the creation around him, in a state that would be surpassed only by the glory of the new creation in Christ.
375 The Church, interpreting the symbolism of biblical language in an authentic way, in the light of the New Testament and Tradition, teaches that our first parents, Adam and Eve, were constituted in an original "state of holiness and justice".250 This grace of original holiness was "to share in. . .divine life".251
376 By the radiance of this grace all dimensions of man's life were confirmed. As long as he remained in the divine intimacy, man would not have to suffer or die.252 The inner harmony of the human person, the harmony between man and woman,253 and finally the harmony between the first couple and all creation, comprised the state called "original justice".
377 The "mastery" over the world that God offered man from the beginning was realized above all within man himself: mastery of self. The first man was unimpaired and ordered in his whole being because he was free from the triple concupiscence that subjugates him to the pleasures of the senses, covetousness for earthly goods, and self-assertion, contrary to the dictates of reason.
378 The sign of man's familiarity with God is that God places him in the garden.255 There he lives "to till it and keep it". Work is not yet a burden,256 but rather the collaboration of man and woman with God in perfecting the visible creation.
379 This entire harmony of original justice, foreseen for man in God's plan, will be lost by the sin of our first parents.
387 Only the light of divine Revelation clarifies the reality of sin and particularly of the sin committed at mankind's origins. Without the knowledge Revelation gives of God we cannot recognize sin clearly and are tempted to explain it as merely a developmental flaw, a psychological weakness, a mistake, or the necessary consequence of an inadequate social structure, etc. Only in the knowledge of God's plan for man can we grasp that sin is an abuse of the freedom that God gives to created persons so that they are capable of loving him and loving one another.
402 All men are implicated in Adam's sin, as St. Paul affirms: "By one man's disobedience many (that is, all men) were made sinners": "sin came into the world through one man and death through sin, and so death spread to all men because all men sinned." The Apostle contrasts the universality of sin and death with the universality of salvation in Christ. "Then as one man's trespass led to condemnation for all men, so one man's act of righteousness leads to acquittal and life for all men."
416 By his sin Adam, as the first man, lost the original holiness and justice he had received from God, not only for himself but for all human beings.
417 Adam and Eve transmitted to their descendants human nature wounded by their own first sin and hence deprived of original holiness and justice; this deprivation is called "original sin".
Tremendous thanks to The Remnant for coming around just in time for this party:
To deny Genesis is to remove the foundations of Catholicism. And therefore, to deny God's literal work on a literal man and a literal woman is an anti-Catholic thing to do. The Church teaches about Adam and Eve as literal people in a literal place in a literal situation.
The people who have fallen into the modernist trap of trying to mesh Scriptures with their own comfortable modern mythologies--these incautious people are enticed and infected by an inveterate disease. Much the same way as a man catches herpes.