LADISLAUS IS NOT CORRECT: In De Veritate Q. 14, a. 11, St. Thomas does say that explicit belief in something is necessary for those who were brought up in the forest or among wild beasts; but he does not unconditionally specify in this context anything more than St. Paul states to the Hebrews in 11:6, ("For he that cometh to God, must believe that he is, and is a rewarder to them that seek him"), when he says on faith in the Summa Theologiae, (as quoted earlier): "Therefore, everyone in every age is bound explicitly to believe that God exists and exercises providence over human affairs."
If something more is required, then God will provide:
"1. Granted that everyone is bound to believe something explicitly, no untenable conclusion follows even if someone is brought up in the forest or among wild beasts. For it pertains to divine providence to furnish everyone with what is necessary for salvation, provided that on his part there is no hindrance. Thus, if someone so brought up followed the direction of natural reason in seeking good and avoiding evil, we must most certainly hold that God would either reveal to him through internal inspiration what had to be believed, or would send some preacher of the faith to him as he sent Peter to Cornelius (Acts 10:20)."
The Church has not defined on this point. I have already quoted the popes who teach that those in invincible ignorance are bound to believe explicitly in God and that He rewards them that seek him. Since this point has not yet been defined, it is just one more patent manifestation of Feeneyite sectarian pretence that they insist that their opinion, although condidered the safer and more common opinion at the time of St. Alphonsus, is to be considered a dogma. But now that in the 19th and 20th Centuries, the pre-Vatican II popes have taught what St. Alphonsus judged to be the less probable opinion on this question, it can only be considered as an expression of contempt for the supreme magisterium of the Church, that they adamantly insist that the opinion contrary to theirs is a heresy.