1. Misrepresentation of the Dogma "Outside the Church there is no salvation."
St Cyprian -> fallible
St Alphonsus -> fallible
"It is worth reminding that this traditional interpretation of the Dogma, including the Three Baptism, is that of St. Cyprian, St. Ambrose, St. Augustine, St. Fulgence, St. Bernard, St. Thomas Aquinas, St. Robert Bellarmine, St. Peter Canisius, St. Alphonsus of Liguori, Pope Innocent II, Pope Innocent III, the Council of Trent, Pope Pius IX, Pope St. Pius X, etc" ->this is simply not true
2. The doctrine on Baptism of Desire is optional
"The truth is that one ought to believe everything that belongs to the Deposit of Faith, both that which has already been defined and that which is not yet defined but is unanimously taught by the Church". -> yes, as long as the fallible teaching does not contradict an infallible one.
"Therefore one ought to believe in the doctrine of three baptisms, as it belongs to the Catholic Faith, though not yet defined". ->Exactly, as it is not defined a Catholic is not bound to believe in it and furthermore, it cannot be defined as it would clearly contradict the Infallible Magisterium. Never could a Pope define infallibly a doctrine contrary to what the Church has always taught.
3. The Council of Trent teaches that Baptism of Desire is sufficient for justification "but not for salvation".
The Church did not teach at Trent that desire for Baptism is sufficient for salvation. Advocates of BOD bring out a passage that is actually dealing with Justification, not Salvation. One can be justified and then go damn oneself anyways. No Council ever used the term "Baptism of Desire". If Trent had defined baptism of desire, then the Council would have contradicted itself. There is not such dogma in the Catholic Church.
The root of the error of the Feeneyites: lack of proper Thomistic Theology
First, Thomistic theology is not the binding teaching authority of Christ Our Lord and His Church. Second, I don't even see where St Thomas taught Baptism of Desire. Again, this is theological speculation. We cannot find ANY infallible source for Baptism of Desire. We can however find MANY infallible quotes where we find that the Holy Church has always taught that there is only one Baptism, solemnized by water, absolutely necessary for salvation and optional for one. One example of many:
Solemn Magisterium:
The Council of Vienne:
“All the faithful must confess only one Baptism, which regenerates in Christ all the baptized, just as there is one God and one faith. We believe that this Sacrament, celebrated in water and in the name of the Father, Son, and Holy Spirit, is necessary for children and grown-up people alike for the perfect remedy of salvation.”