St. Augustine: “If you wish to be a Catholic, do not venture to believe, to say, or to teach that ‘[u][b]they whom the Lord has predestinated for baptism can be snatched away from his predestination, or die before that has been accomplished in them [/b][/u]which the Almighty has predestined.’ There is in such a dogma more power than I can tell assigned to chances in opposition to the power of God, by the occurrence of which casualties that which He has predestinated is not permitted to come to pass. [u][b]It is hardly necessary to spend time or earnest words in cautioning the man who takes up with this error against the absolute vortex of confusion into which it will absorb him[/b][/u], when I shall sufficiently meet the case if I briefly warn the prudent man who is ready to receive correction against the threatening mischief.” (On the Soul and Its Origin 3, 13)
The dogma is clear and final:
Pope Eugene IV, Council of Florence, “Cantate Domino,” 1441, ex cathedra:
“The Holy Roman Church firmly believes, professes and preaches that all those who are outside the Catholic Church, not only pagans but also Jews or heretics and schismatics, cannot share in eternal life and will go into the everlasting fire which was prepared for the devil and his angels, unless they are joined to the Church before the end of their lives; that the unity of this ecclesiastical body is of such importance that only those who abide in it do the Church’s sacraments contribute to salvation and do fasts, almsgiving and other works of piety and practices of the Christian militia productive of eternal rewards; and that nobody can be saved, no matter how much he has given away in alms and even if he has shed blood in the name of Christ, unless he has persevered in the bosom and unity of the Catholic Church.”
I think you really need to study the Catholic Faith and meditate on the ordinary words in the dogmas on EENS, the faithful, Heretics, Jews, Pagans, and all human creatures and accept the reasonable fact that the Pontiffs who pronounced these decrees were perfectly literate and fully cognizant of what they were saying. If there were any need to soften or qualify their meanings, they were quite capable of doing so.
Being ex cathedra definitions, they must be taken literally, unequivocally, and absolutely. Hence, to attempt to modify or qualify them in any way is to deny them.
The doctrine says that only Catholics go to Heaven; all others are lost, that is, they do not go to Heaven, but to Hell. All who are inclined to dispute this dogma should have the good sense to realize that if this is not what the words of the definitions mean, the Church would never have promulgated such a position. To give any other meaning to these words is to portray the Church as foolish and ridiculous.