In stark contrast to those who believe the deadliest sin is a sin for which we aren’t even responsible!
It is refreshing to return to the sanity of the Church’s teaching:
Now we’ve resorted to defamation. Wonderful.
“Pelagius held that man could, by the natural power of free will and without the necessary help of God’s grace, lead a morally good life; he thus reduced the influence of Adam’s fault to bad example.”
CCC, Paragraph 406, Sentence 2.
Remember, Pelagius was a -heretic- for viewing it this way.
By contrast, St. Thomas Aquinas, who was -not- a heretic, wrote…
“It is written (John 1:29): ‘Behold the Lamb of God, behold Him Who taketh away the sin of the world’: and the reason for the employment of the singular is that the “sin of the world” is original sin, as a gloss expounds this passage.”
Summa, First Part of the Second Part, Q82, A2.
Therefore, we cannot be freed from original sin without the special intervention that Jesus undertook on our behalf.
Furthermore…
Pope Eugene IV, Council of Florence, “Letentur coeli,” Sess. 6, July 6, 1439: “We define also that… the souls of those who depart this life in actual mortal sin, or in original sin alone, go straightaway to hell, but to undergo punishments of different kinds.”
So yes; you will go to Hell as a result of original sin, unless Jesus takes that sin away, and the normative way for this to happen is through the sacrament of Baptism. Any further protestations that I’ve somehow rebelled against the teachings of the Church will simply be empty. I’m -talking about- the teachings of the Church.
Finally, as to the actual nature of original sin in each individual man…
Pope Pius XI, Mit brennender Sorge (# 25), March 14, 1937: “‘Original sin’ is the hereditary but impersonal fault of Adam’s descendants, who have sinned in him (Rom. v. 12). It is the loss of grace, and therefore eternal life, together with a propensity to evil, which everybody must, with the assistance of grace, penance, resistance and moral effort, repress and conquer.”
So yes; as long as we remain in original sin, we have lost eternal life.