You're claiming that Pius IX teaches that people who suffer from invincible ignorance of truths necessary for salvation can be saved in that state. [Pelagianism]
WE are saying that Pius IX teaches that people who suffer from invincible ignorance of these truths are in a position to be saved by the operation of divine light (to enlighten their ignorance) and are "in the way" of salvation. [Non-Pelagian]
The Pelagian apostles of indifferentism ultimately do not believe that God has the power to enlighten the ignorant natives.
They reject the teaching of St. Leonard of Port Maurice:
Brothers, you must know that the most ancient belief is the Law of God, and that we all bear it written in our hearts; that it can be learned without any teacher, and that it suffices to have the light of reason in order to know all the precepts of that Law. That is why even the barbarians hid when they committed sin, because they knew they were doing wrong; and they are damned for not having observed the natural law written in their heart: for had they observed it, God would have made a miracle rather than let them be damned; He would have sent them someone to teach them and would have given them other aids, of which they made themselves unworthy by not living in conformity with the inspirations of their own conscience, which never failed to warn them of the good they should do and the evil they should avoid.
Orestes Brownson's explanation of the subject is also worth reading:
Did we reflect on what the Church is, did we consider her rank in the universe, her relation to God, the place she holds so to speak, in his affections, the bare thought of the salvation of a single soul not spiritually begotten of her should make us thrill with horror. It would give the lie to all God's providences, and subvert the whole economy of His grace. We need not start at this. All may have the Church for their mother, if they choose. Christ is in the Church, but He is also out of the Church. In the Church He is operating by His grace to save those who enter; out of her He operates also by His grace, or is ready to operate, in the hearts of all men, to supply the will and ability to come in. Do not imagine that God has only half done His work, that He has merely prepared His Church, fitted her up as a palace, filled her with good things, all things necessary for our salvation, when once we have entered, but that He has left us without the ability to find her out, or, having found her out, without ability to enter. He leaves nothing undone. No man has the natural ability to come into the Church, any more than he has the natural ability to save himself after he has come in. All before and all after is the work of God. We can do nothing of ourselves alone – make not even the first motion without His grace inciting and assisting us. Of no use would have been His Church – it would have been a mere mockery, or a splendid failure – if He had not provided for our entrance as well as for our salvation afterwards.
This quote from Brownson comes from They Fought the Good Fight http://loretopubs.org/they-fought-the-good-fight.html
Amen! Now this leaves one question- is it reasonable or unreasonable to assume every act of enlightenment will be accompanied by baptism? Or maybe God wants to display his sovereignty by saving in a variety of ways? He certainly likes variety. Just look at birds.
Our Lord did say that he who believes and is baptized
will be saved. Dogmatic Church Councils have affirmed that Our Lord's words on the subject are to be taken literally. Also, it is only through baptism that a man can become a member of the Church, and there is no salvation outside the Church.
The letters of missionaries record many instances of people who died immediately after baptism, and the missionaries have said that they think that God preserved their life precisely for this purpose. http://eens123.blogspot.com/2009/08/their-life-had-only-been-preserved-by.html
St. Francis Xavier, May, 1546: "Here (Ambon Island of Indonesia) there are altogether seven towns of Christians, all of which I went through and baptized all the newborn infants and the children not yet baptized. A great many of them died soon after their baptism, so that it was clear enough that their life had only been preserved by God until the entrance to eternal life should be opened to them.
" Coleridge, Henry. The Life and Letters of St. Francis Xavier. (1872) p. 375
Fr. De Smet, Dec. 9, 1845: "I have often remarked that many of the children seem to await baptism before winging their flight to heaven, for they die almost immediately after receiving the sacrament
." Laveille, Eugene. The Life of Father de Smet, S. J. (1915) p. 93 "… over a hundred children and eleven old people were baptized. Many of the latter [the old people], who were carried on buffalo hides, seemed only to await this grace before going to rest in the bosom of God
." Laveille, Eugene. The Life of Father de Smet, S. J. (1915) p. 172
"Are not two sparrows sold for a farthing? and not one of them shall fall on the ground without your Father."