It's basic stuff for someone who has been taught to regurgitate the Baltimore Catechism, but not so basic if you never went to any kind of Catechism. Eastern thinking tends to be more abstract, and they don't appear to be very good at clearly defining concepts the way we do in the West due to the scholastic theological movement. They never really had a scholastic period where the emphasis was on being precise in your terms and definitions.
You are talking to a public school educated person who was basically never catechized. I don't even remember ever going to Sunday school for 1st communion, all I remember is the nice white suit and arm band and hair cut, and I only remember that because I have a picture. Then there was my Confirmation at 13, I learned nothing there either, we were 6 wild public school boys in the Sunday school class, and all we did was throw things at each other, our teacher was a layman. When the bishop came, we were put together with the Catholic school class of like 30 students and we hid in the back and never had to answer a question. I learned
NOTHING, and that Confirmation was 2 years before the Novus Ordo. I lived my life in the world for the first 40 years with no knowledge of "concepts" as you call it. I stopped going to mass shortly after my confirmation, at like 14. I had zero learning and yet I knew not to go to communion whenever I went to many many weddings or funerals during the next 26 years. I knew that if I did, God work strike me down and turn me into a piece of fried bacon. How is it possible that an Easter Catholic person
who goes to mass every Sunday all their lives never learned something so basic?
You are making excuses for them, their faith is just a cultural thing, no different
today than any South American.