Galatians 2:11 When Cephas came to Antioch, I opposed him to his face, because he stood condemned. 12 For before certain men came from James, he used to eat with the Gentiles. But when they arrived, he began to draw back and separate himself from the Gentiles because he was afraid of those who belonged to the circumcision group. 13 The other Jews joined him in his hypocrisy, so that by their hypocrisy even Barnabas was led astray.
Philipians 1:17 The former preach Christ out of selfish ambition, not sincerely, supposing that they can stir up trouble for me while I am in chains.
2 Thessalonians 1:6 God is just: He will pay back trouble to those who trouble you
1 Timothy 1:3 As I urged you when I went into Macedonia, stay there in Ephesus so that you may command certain men not to teach false doctrines any longer
2 Timothy 2:17 Their teaching will spread like gangrene. Among them are Hymenaeus and Philetus,
1 John 4:1 Dear friends, do not believe every spirit, but test the spirits to see whether they are from God, because many false prophets have gone out into the world.
Galatians 1:8-9 But even if we or an angel from heaven should preach a gospel other than the one we preached to you, let them be under God’s curse! 9 As we have already said, so now I say again: If anybody is preaching to you a gospel other than what you accepted, let them be under God’s curse!
2 Corinthians 11:4 For if someone comes to you and preaches a Jesus other than the Jesus we preached, or if you receive a different spirit from the Spirit you received, or a different gospel from the one you accepted, you put up with it easily enough.
2 Corinthians 11:13 For such people are false apostles, deceitful workers, masquerading as apostles of Christ. 14 And no wonder, for Satan himself masquerades as an angel of light. 15 It is not surprising, then, if his servants also masquerade as servants of righteousness. Their end will be what their actions deserve.
Acts 20:29 I know that after I leave, savage wolves will come in among you and will not spare the flock.
And Peter warns us---
2 Peter 2:1-3 But there were also false prophets among the people, just as there will be false teachers among you. They will secretly introduce destructive heresies, even denying the sovereign Lord who bought them—bringing swift destruction on themselves. 2 Many will follow their depraved conduct and will bring the way of truth into disrepute. 3 In their greed these teachers will exploit you with fabricated stories. Their condemnation has long been hanging over them, and their destruction has not been sleeping.
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 kept being 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.