Nice to see ya around the forum verga!
“I think you are confused, you must be thinking of either Sola Scriptura, or Sola fidei, or perhaps both.”
Not thinking about either of those. I’m thinking only that God has revealed His inspired word over thousands of years and it declares it is sufficient for salvation and maturity. In that Word, we fail to locate the idea that Mary had an immaculate conception.
Ergo, unnecessary for salvation or maturity.
We? I locate it just fine, thank you, in the word that Gabriel used to salute blessed Mary, kecharitomene, which Jerome quite correctly rendered into Latin as "full of grace". It means that Mary was already "graced" in a completed and past act. And remember that the angel came directly from the throne of God, and addressed her that way as though it was her name.
“Ergo, unnecessary for salvation or maturity.”
So, God is wrapping up Creation, and He says (to Himself), “Let’s see. How many Graces are necessary at a bare minimum for salvation?”
And He bestows just these Graces on mankind.
But wait! Many still send themselves to Hell, even though those “necessary” Graces are available. What does He do now? He says, “Tough bananas. Other people made it to Heaven with just those Graces. They should have tried harder.”
Does that square with His desire that all should be saved?
Or does He give more Graces, above and beyond the merely “necessary,” that more should be saved? And given that He is outside of time, and omnipotent, would he wait to bestow “super-necessary” Graces, or would He give them to us in the beginning?
The notion that a Grace does not exist because it is (in some man’s eyes) not “necessary” for salvation, is of and from Satan.