Jesus didn't think of the printing press for almost 1500 years AD. If the "book" was the sole authority to teach us how to best follow Christ... why the long preparation of illiteracy along with the absence of a cheap, availability of mass production of bibles?
The teaching authority of the church flies in the face of this one choice by Christ for His Kingdom that began as He sent the Holy Spirit upon the Apostles.
Acts 2:42 is the New Testament Church at work in the world!
The books and letters from the apostles were read and shared by the Christians from the beginning.
With your false reasoning to follow the Catholic church, you would have to insist that all the killings under papal authority was justified and decreed by God.
Paul warned the true believers that false teachings would come.
2 Timothy 2:17 Their teaching will spread like gangrene. Among them are Hymenaeus and Philetus,
Paul warned that even from among them wolves would come in.
Acts 20:29 I know that after I leave, savage wolves will come in among you and will not spare the flock.
The Catholic religion steadily brought in heresies.
Prayers for the dead and sign of the cross, approximately began in 310 AD.
Many heresies were added.
The title of pope or universal bishop, was first given to the bishop of Rome by the emperor Phocas, 610 AD.
Who was in charge of your religion before that, before 610 AD, since you claim your church, as you know it has been the truth from the beginning.
We have to watch our lives and our doctrines carefully.
Those who are Catholic did not watch carefully.