David, you are using contradictory terms, that’s why your posts are confusing (and why many others who post on this topic are confused as well).
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1. Someone who is invincibly ignorant of the Faith cannot be saved. They also cannot receive BOD, because being ignorant of the Faith, they are also logically ignorant of baptism, so they couldn’t desire it.
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If you want to say that God CAN enlighten an ignorant person about the Faith, so they can accept it and be saved, well, ok. But no one, including Fr Feeney, would disagree with you.
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In the above example, an “invincibly ignorant” person was not saved; to say so is a contradiction. To properly phrase it - a FORMERLY ignorant person was enlightened by God, baptized a catholic, and was saved before they died. Only Catholics make it to heaven.
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2. It is neither a doctrine of the Faith, nor is it held by many saints, nor is it in Scripture that “invincible ignorance” is even possible. For as John chapter 1 tells us (infallibly) that Christ “enlightens all men who come into the world”. Can one be ignorant of God? Absolutely not; it is heresy this say so.
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Can one be ignorant of the Faith? Surely so, for sin blinds us all and those who do not follow the natural law/10 commandments can be ignorant as a punishment from God.
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Can an invincibly ignorant person make it to heaven? No. Only if God enlightens them and takes away their ignorance can one know the Faith and then accept it. Again, only good Catholics can be saved.