No one is questioning your ability to read what God says: we disagree with your ability to understand it, and the multiplicity of "Bible-only" sects and congregations certainly lends that view credence.
It is not Bible-only. It praying to Jesus, reading the Bible, and understanding it with help from the Holy Spirit.
According to the RCC catechsim, found at Vatican.va, all Scripture must be interpreted by the magisiterium, the bishops and the pope before being read and understood by members of the church.
85 "The task of giving an authentic interpretation of the Word of God, whether in its written form or in the form of Tradition, has been entrusted to the living teaching office of the Church alone. Its authority in this matter is exercised in the name of Jesus Christ."47 This means that the task of interpretation has been entrusted to the bishops in communion with the successor of Peter, the Bishop of Rome.
This method of understanding the Bible is not found in Scripture anywhere. In fact, that paragraph from the catechism would fit the definition of "stumbling block."
God speaks to individuals through His holy word, to those men and women whom He has first given new ears and new eyes and a new heart with which to understand His word and believe in Christ as their only salvation.
"The hearing ear, and the seeing eye, the LORD hath made even both of them." -- Proverbs 20:12
Those individuals with eyes to see and ears to hear make up the church of Jesus Christ on earth. Some denominations contain more Scriptural truth than others. Those are the churches Christ's flock resides in.
Other churches have devolved into so much error that Christ is nearly obscurred and men led astray, away from the cross towards men's own egocentric "worthiness."