The concern isn’t with whether the conscience has no role, but whether it is the ultimate determinant of good and evil
Of course it is, here and now, for me.
The problem is you confuse non imputability of my personal sins (which are non culpable precisely because I believe I am acting well and am not culpably ignorant) with universal “good”.
The Marist Brothers, the church, and Ratzinger are all external voices (your argument), and do not override what the individual internally believes.
So my point went over your head. These external voices allowed me to realise the self evident internal truth of my own understanding of conscience…which aligns with theirs and hence Church teaching. Not that it would change my certainty if it could be demonstrated Church Teaching was somewhat different.
f I happen to believe it is self evident that the strong can take from the weak, no argument can refute that.
obviously the truth of inner authority is different from a logical apriori tautology like this. A tautology cannot be denied…to do so indicates insanity. One person’s self evident truth can be denied by another without indicating insanity…nevertheless it is still irrefutable by mere argument. If one hears echoes of God’s voice within it is hard not to hear it.
I don’t categorize church doctrines as correct and incorrect. I assume the doctrines are correct although I don’t necessarily assume that I understand them correctly.
Surely in so far as you always interpret disputed teachings to suit your strict and conservative temperament you are just as much a moral relativist as those you criticise?
You just wear better clothes and say your subjective interpretation is the correct objective one and save a bit of face

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You cannot appeal to church teaching on one hand and dismiss it as merely an external opinion on the other.
I am not aware of appealing to any Church teaching for my authority other than to identify your contradictions. All Church teachings are external.
If they are meaningful to me it is because somewhere in the past, like you, I internally ratified them or the makers of them. That is not an irreversible affirmation nor an all or nothing situation…if unusual contradictions seem to arise that may mean, in a worst case scenario when they are unable to be resolved, the internal assent may get put on hold until resolved.
If the Church forced internal assent while in this messy state it would obviously not be possible and, as already stated, one would have to leave the Church if forced to decide.
While this is always a possibility I have not yet encountered an infallible teaching of such gravity that requires those who cannot internally assent to leave the Church.
I don’t think AL is such a one…though it may be for some.
If the certain conscience is your ultimate expression of what you must do, fine. That is your personal choice. Having made it, however, you must acknowledge that others have the same right to make that decision for themselves.
Of course, this is all very obvious and correct when acting in ones own private affairs from certain conscience. Why would anyone think otherwise.
That being the case, if each of us is free to create his own morality there is no possibility of critiquing anyone else.
Well that’s a complete non sequitur.
If you were a concerned friend I would be wanting to hear why you thought my private actions were damaging to me or my family. If you were not a friend or involved I would politely tell you to mind your own business.
But if morality is nothing more than what each individual believes the concept of morality is empty of meaning.
It is self evident one can only live one’s own system of morality as constructed over the years as learnt from experience and from the good advice of trusted friends wiser than ourselves (the Church for me is included there). So yes, that sounds like “what each individual believes morality to be” as you rightly state. How can it be otherwise? Everybody does this, that’s why we all have differences of moral opinion.
Does that then mean the “concept of morality is meaningless”?
That’s a ridiculous conclusion.
If morality is founded in natural law then all people of good conscience will tend to act in the same way under identical practical circumstances and tend to hold to similar principles if understood the same way.
But it will never be a perfect match but rather a tendency as learning of natural law is a life long process and we all read and write less than perfectly.