Anyone who denies that souls have been saved by baptism of desire and blood, is guilty of objective mortal sin, because he denies a proposition that is theologically certain, inextricably bound up with Catholic doctrine. Funnily enough, inculpable ignorance alone would excuse you of subjective guilt. Yet you don't believe in it, and make no allowance for it in your judgments, and it is characteristic of divine Justice to judge you by the same standard with which you judged others.
You propagators of this error should cease and desist, and humbly confess the Catholic doctrine.
As for the baptized who die before the age of reason who cannot make an act of faith, here is the Church Infallible teaching:
Pope Innocent III Apostoli Letter on Baptism
So now Pope Innocent is infallible in some letters and not in others?
To your inquiry we respond thus: We assert without hesitation (on the authority of the holy Fathers Augustine and Ambrose) that the priest whom you indicated (in your letter) had died without the water of baptism, because he persevered in the faith of holy mother the Church and in the confession of the name of Christ, was freed from original sin and attained the joy of the heavenly fatherland. Read (brother) in the eighth book of Augustine's "City of God" * where among other things it is written, "Baptism is ministered invisibly to one whom not contempt of religion but death excludes." Read again the book also of the blessed Ambrose concerning the death of Valentinian * where he says the same thing. Therefore, to questions concerning the dead, you should hold the opinions of the learned Fathers' and in your church you should join in prayers and you should have sacrifices offered to God for the priest mentioned.
This is the teaching that the Magisterium has approved. Irrelevant to what was held before, at least after the letter, no one is permitted to hold the contrary. And in fact no one did, all Catholic schools, all theologians, all Saints and Doctors after this point in time teach that there are souls saved by baptism of desire.
the Jew mentioned must be baptized again by another, that it may be shown that he who is baptized is one person, and he who baptizes another. . . . If, however, such a one had died immediately, he would have rushed to his heavenly home without delay because of the faith of the sacrament, although not because of the sacrament of faith
Anyone who denies that souls are saved by baptism of desire and blood is guilty of mortal sin.
No. An implicit faith is not sufficient. A person that has reached the age of reason, is
obliged to profess an explicit belief in the Holy Trinity, The Incarnation, and the Catholic Faith before they die. This truth is necessary to believe for Salvation as a necessity of means.
Pope Eugene IV Exultate Deo ex cathedra:
"
Whoever wishes to be saved, needs above all else to hld the Catholic Faith: unless each one preserve this whole and entire, he will without a doubt perish in eternity...then he defines the Holy Trinity, the Incarnation, and the necessity to believe in these truths...
This is the Catholic Faith; unless each one believes this faithfully and firmly, he cannot be saved."
Again, an implicit faith / desire is not enough and furthermore, we are obliged to believe this truth. There is the necessity to explicitly believe and profess the Catholic Faith. Popes such as Pius X, Clement XI, Pius IX all have reaffirm and re-stated this dogma. BODers have fallen pray of liberal ideas and false notions concerning ecuмenism and universal salvation. Watered down, lukewarm Catholics are the real enemies of the Faith and a real thread for the purity of it.