You're right, but my experience has been that the vast majority of RC's I know don't know the half of what they are supposed to believe. They think of themselves as Christians, but don't know The Gospel and attend church because that's what good people are supposed to do. Now, are they kept in the dark because they are easier to control that way (this assumes a grand puppet master), or are they in the dark because they just trusted their church would never make mistakes. I think it's the latter.
They don't search their Bibles for the Truth. They rely on others to do it for them. My 2 sons are a great case in point. They both attended a RC high school. In religion class they were the only ones who knew where to look in their Bibles to argue with the Priest and Nuns about the error of their beliefs. The others just assumed whatever they told them was correct.
Of course, it's also the spoon-fed mentality, here I am with my little open mouth, feed me. Prevalent in state run institutions that don't encourage thinking. That baby gets pablum. Hunters grow up and get the meat.
That must have made for some interesting discussions! Hopefully the priest and the nuns learned something