The CC had taught the basics, we had knowledge of God, and of course my parents were
Catholic. We were taught the sacraments, the trinity, the prayers, how to go to confession, not much about Mary except she is the Immaculate Virgin, touched on the Rosary, all mainly the sacraments. My parents made us say prayers of course, and follow the commandments. Oh Holy Communion, never told it was the flesh, but that it was the Real Presence, Body,Blood,Soul, and Divinity of Christ, it was a miracle didn’t need to know how it happened.
So yes, the basics, by the time I graduated did I have a personal relationship with the Lord of my life, no, not at all, but I knew the prayer and the sacrements and what to do at Mass.and I sure knew what helll was. Glad my brother gave me a Bible in the 80’s, because before that never thought about reading the Bible , why, told it was not necessary for us to read.
Oh and it wasn’t till later in life looking back on it I realized I didn’t really know Jesus or much at all, I had thought I did, but I didn’t, just knew what we were taught by the Church, the sacraments for salvation.