Not so. Do you personally know many catholics that you believe they know the Scriptures very well?
Every Catholic I know except for the very young knows the Scriptures as well as or better than I do. (I am a convert from Protestantism - I was an Elder, and I taught a lot of Sunday School and Bible study classes when I was a Protestant - I was considered “knowledgable” of the Scriptures by both liberal and evangelical Protestants; I was often invited to speak at the Wednesday meetings of my local Plymouth Brethren congregation, and as you know they are no slouches when it comes to the Bible.)
Can you give me a couple of examples?
For example, the story of the disciples on the road to Emmaus gives us a picture of what we should look for at the Mass - the four parts of the story correspond to the four parts of the Mass - first, they are gathered in the presence of Christ, next, the breaking open of the Scriptures and the explanation of their meaning, then the recognizing of Jesus in the breaking of the bread, and then, the going forth to proclaim the good news to all the world.
Mass -------------------------------------------- Disciples on the road to Emmaus
Gathering Rite ------------------------------- Disciples meet a stranger and walk with him.
Liturgy of the Word ------------------------ Jesus opens the Scriptures to them and
------------------------------------------------------ explains their meaning
Liturgy of the Eucharist ------------------ They sit down to supper, and recognize Jesus
------------------------------------------------------------ in the breaking of the bread
Dismissal Rite ------------------------------- They return with great joy to Jerusalem and announce
------------------------------------------------------------ that Jesus is risen from the dead.