Many Catholics DO know the Bible very well. But most lay people do not.
This is my experience as a 35 year Catholic. Most of my family are Catholics and extended family (aunts, uncles, cousins, nieces and nephews) are pretty much clueless when it comes to the Bible. And some of them are very active in the Catholic Church.
Most Lutherans don’t know it very well, either.
Mormons and Jehovahs Witnesses, on the other hand, know it very well. And haven’t got a clue as to what it all means.
Please don’t be offended, but the truth is, most Catholic lay people know the Word of God better than any Protestant.
The Word of God comes in the Traditions of Jesus Christ and Scripture. The Traditions of Jesus Christ are essential for a proper understanding of the Word of God. They are the underpinning of the Scriptures. Jesus did not write Scripture. He established a Church and deposited in that Church the Traditions. It is based upon these Traditions that the Church wrote the New Testament.
And Protestants who think they know the Bible are only repeating the extra-biblical traditions of men taught them by their respective churches. They rejected the true Word of God when they rejected the Traditions of Jesus Christ. Now they try to pin the Word of God on top of traditions and practices which can nowhere be found in the Bible.
That’s the truth.