If we think Paul didn’t know all the errors we face, maybe we ought to go back and look at who and what Paul was talking about as he wrote his letters to the various churches.
In Romans, Paul decries legalism, libertinism, pride, racism, and anarchy – and he was writing to people whom he longed to see, and thought highly of in terms of the faith.
In 1 & 2 Corinthians, Paul decries exalting teachers, intellectual and spiritual pride, lax church discipline, sexual immorality, material squabbling, seeking recourse in secular venues outside of the church, false views of marriage, both idolatry and being a slave to the fear of idolatry, false views about Christian liberty, abuse of the Lord's Table, abuse of common worship in the demonstration of spiritual gifts, false views of the Gospel, church discipline which does not aim to redeem but seeks only to punish, the fear of death, stingy giving, and interestingly those who think they know more than the Apostles do about the Gospel, Christ and the church. His view of what to do about false teachers is especially useful if you care to review it in 2Cor 10 & 11. And these were people whom he himself established in the faith – people who literally got it from the bondservant's mouth.
In Galatians, Paul decries adding works to the Gospel, and showing partiality based on observances, and rejects circumcision as necessary, and underscores the necessity of unity under truth in the church – in spite of the fact that he had to defy Peter to his face to do it! He didn’t say, "and I never set foot in any house with Peter ever again." You know: Peter who got the vision from God, "take and eat"? Nobody abandoning the Galatian church in spite of that.
In Ephesians, Paul expresses the fully-orbed Gospel and uses it to say, "I therefore, a prisoner for the Lord, urge you to walk in a manner worthy of the calling to which you have been called, with all humility and gentleness, with patience, bearing with one another in love, eager to maintain the unity of the Spirit in the bond of peace." And leaps off from there to exhort to personal holiness, submission to each other, the true nature of marriage and the roles of husband and wife, the roles in family and society, and the method by which we are girded up against the temptations of the world.
Listen: that's not even all of the letters Paul wrote, and almost all of the problems in the modern church are actively and openly addressed. If you're worried that he doesn't list Joseph Smith or Benny Hinn by name, maybe what you ought to do is see if he mentions you by name and wonder if there are any logical implications to that.
See: the foundational premise of Scripture is not that we should read it. The foundational premise of Scripture is that it is sufficient for our equipping; reading is a consequence of sufficiency. And the equipment in Scripture says that the church is necessary and that this is the place where we first and foremost stand for the truth of the Gospel, and in standing for truth we stand together.
If you are holed up in your study in your robe reading and writing blogs, but you can't find a church that suits you, you are not standing on the sufficiency of Scripture: you are sitting in your robe. If Scripture is sufficient to tell you that Your Best Life Now is a fraud and that no pastor should emulate it to his congregation, it is also sufficient to tell you – and let me make it clear that I mean you personally, you the one who is unable to find one believer whom you do not have parental authority over with which to fellowship -- that you belong joined together with other believers in a visible and social way which demonstrates the glory of God to the world.