Were you born with this understanding or did you experience some sort of epiphany when you saw this idea in print? I disagree with your statement “A Catholic who knows the Church teaches something is a sin of grave matter but doesn’t understand the teaching is not let off the hook because of their lack of understanding.”
When I was in second grade the nun who was my teacher taught us that french kissing was a mortal sin. None of us knew what french kissing was but we knew that a mortal sin was very bad and all of us worried that perhaps we had sinned this way and were doomed to hell. I was also taught that if I needed to sneeze in church during Mass and believed that if I sneezed I would commit a mortal sin and sneezed anyway, then I had committed a mortal sin.
That is basically what I was taught about the Catholic faith. I didn’t understand the Mass because it was in Latin with a tad of Greek and the homilies didn’t make much sense either. I received the Sacraments without knowing what they were or why they were important. I was never taught these things. NEVER. Yet you tell me that I would have been damned even though I was not aware?
I binged “catholic church heresy” and found the following which even I, with my limited intelligence and brain damage due to chronic pain and opiate use was able to comprehend:
"St. Thomas (II-II:11:1) defines heresy: “a species of infidelity in men who, having professed the faith of Christ, corrupt its dogmas”. "The right Christian faith consists in giving one’s voluntary assent to Christ in all that truly belongs to His teaching. There are, therefore, two ways of deviating from Christianity: the one by refusing to believe in Christ Himself, which is the way of infidelity, common to Pagans and Jews; the other by restricting belief to certain points of Christ’s doctrine selected and fashioned at pleasure, which is the way of heretics. The subject-matter of both faith and heresy is, therefore, the deposit of the faith, that is, the sum total of truths revealed in Scripture and Tradition as proposed to our belief by the Church. The believer accepts the whole deposit as proposed by the Church;** the heretic accepts only such parts of it as commend themselves to his own approval. The heretical tenets may be ignorance of the true creed, erroneous judgment, imperfect apprehension and comprehension of dogmas: in none of these does the will play an appreciable part, wherefore one of the necessary conditions of sinfulness–free choice–is wanting and such heresy is merely objective, or material.** On the other hand the will may freely incline the intellect to adhere to tenets declared false by the Divine teaching authority of the Church. The impelling motives are many: intellectual pride or exaggerated reliance on one’s own insight; the illusions of religious zeal; the allurements of political or ecclesiastical power; the ties of material interests and personal status; and perhaps others more dishonourable. Heresy thus willed is imputable to the subject and carries with it a varying degree of guilt; it is called formal, because to the material error it adds the informative element of “freely willed”.
Pertinacity, that is, obstinate adhesion to a particular tenet is required to make heresy formal. For as long as one remains willing to submit to the Church’s decision he remains a Catholic Christian at heart and his wrong beliefs are only transient errors and fleeting opinions. Considering that the human intellect can assent only to truth, real or apparent, studied pertinacity — as distinct from wanton opposition — supposes a firm subjective conviction which may be sufficient to inform the conscience and create “good faith”. Such firm convictions result either from circumstances over which the heretic has no control or from intellectual delinquencies in themselves more or less voluntary and imputable.** A man born and nurtured in heretical surroundings may live and die without ever having a doubt as to the truth of his creed. On the other hand a born Catholic may allow himself to drift into whirls of anti-Catholic thought from which no doctrinal authority can rescue him, and where his mind becomes incrusted with convictions, or considerations sufficiently powerful to overlay his Catholic conscience. It is not for man, but for Him who searcheth the mind and heart, to sit in judgment on the guilt which attaches to an heretical conscience. ** (emphasis mine)
newadvent.org/cathen/07256b.html
I emphasized the parts I believe are important to my case. Did you see in a previous post where I stated that I didn’t even know I was a heretic? I can only say that I was a heretic now because I can look at what I did. But when I left the Church I didn’t even know what heresy was. Yet you say this doesn’t matter. OK, fine. Then please look at the last line of the quote. Here it is quite clear that God is the one who judges me, not you. God loves me; God knows what is in my heart; God died for me. FOR ME. I am not afraid of His judgment because I know Him and I want to be with Him.
I won’t go further with this. It has caused me immense pain. I think you are so wrapped up in theology that you can’t see the love of God and that is a shame. God’s love conquers all. That is all I’m going to say.