From Patristic scholar Fr. William Jurgens, author of the three volume set Faith of the Early Church Fathers, a compilation of quotes from the Fathers.
“If there were not a constant tradition in the Fathers that the Gospel message of ‘Unless a man be born again of water and the Holy Ghost he cannot enter into the kingdom of God’ is to be taken absolutely, it would be easy to say that Our Savior simply did not see fit to mention the obvious exceptions of invincible ignorance and physical impossibility. But the tradition in fact is there; and it is likely enough to be found so constant as to constitute revelation.”
How can anyone read these clear dogmatic decrees below and still conclude that a person can be saved who dies without being a baptized Catholic in a state of grace?
Council of Trent, Session VI Decree on Justification,
Chapter IV.
A description is introduced of the Justification of the impious, and of the Manner thereof under the law of grace.
By which words, a description of the Justification of the impious is indicated,-as being a translation, from that state wherein man is born a child of the first Adam, to the state of grace, and of the adoption of the sons of God, through the second Adam, Jesus Christ, our Saviour. And this translation, since the promulgation of the Gospel, cannot be effected, without the laver of regeneration, or the desire thereof, as it is written; unless a man be born again of water and the Holy Ghost, he cannot enter into the Kingdom of God (John 3:5).
Chapter VII.
What the justification of the impious is, and what are the causes thereof.
This disposition, or preparation, is followed by Justification itself, which is not remission of sins merely, but also the sanctification and renewal of the inward man, through the voluntary reception of the grace, and of the gifts, whereby man of unjust becomes just, and of an enemy a friend, that so he may be an heir according to hope of life everlasting.
Of this Justification the causes are these: the final cause indeed is the glory of God and of Jesus Christ, and life everlasting; while the efficient cause is a merciful God who washes and sanctifies gratuitously, signing, and anointing with the holy Spirit of promise, who is the pledge of our inheritance; but the meritorious cause is His most beloved only-begotten, our Lord Jesus Christ, who, when we were enemies, for the exceeding charity wherewith he loved us, merited Justification for us by His most holy Passion on the wood of the cross, and made satisfaction for us unto God the Father; the instrumental cause is the sacrament of baptism, which is the sacrament of faith, without which no man was ever justified;
(Just in case anyone wants to refute what that quote above means, I quote below the same thing said at the Council of Florence:)
Pope Eugene IV, The Council of Florence, “Exultate Deo,” Nov. 22, 1439, ex cathedra: “Holy baptism, which is the gateway to the spiritual life, holds the first place among all the sacraments; through it we are made members of Christ and of the body of the Church. And since death entered the universe through the first man, ‘unless we are born again of water and the Spirit, we cannot,’ as the Truth says, ‘enter into the kingdom of heaven’ [John 3:5]. The matter of this sacrament is real and natural water.”
Council of Trent. Seventh Session. March, 1547. Decree on the Sacraments.
On Baptism
Canon 2. If anyone shall say that real and natural water is not necessary for baptism, and on that account those words of our Lord Jesus Christ: "Unless a man be born again of water and the Holy Spirit, he cannot enter into the kingdom of God (John 3:5), are distorted into some metaphor: let him be anathema.
Canon 5. If any one saith, that baptism is optional, that is, not necessary unto salvation; let him be anathema
Pope Pius XII, Mystici Corporis (# 22), June 29, 1943: “Actually only those are to be numbered among the members of the Church who have received the laver of regeneration and profess the true faith.”
Pope Pius XII, Mediator Dei (# 43), Nov. 20, 1947: “In the same
way, actually that baptism is the distinctive mark of all
Christians, and serves to differentiate them from those who
have not been cleansed in this purifying stream and
consequently are not members of Christ, the sacrament of holy
orders sets the priest apart from the rest of the faithful who
have not received this consecration.”