Tolerating false teachers is not only dangerous, it is also disobedience to God.
The new testament writers did not set the example of tolerance, and in some cases, complacency, which some ministers are choosing to follow regarding false teachers.
The Bible has much to say regarding false teachers, false ministers, and false doctrines. Never does the Bible treat these with kid gloves. On the contrary, false teachers and false ministers (false apostles/false prophets, etc.) are ministers of Satan who are deceitful workers. ~ 2 Corinthians 11:13- 15
In the book of Acts, Paul warned and commissioned the elders of Ephesus to be on the watch regarding false teachers. ~ See Act 20:17 – 32
Paul also wrote the book of Galatians to counter to teachings of the Judaizers, referring to them as “FALSE BRETHREN,” saying,“we refused to give in to them for a single moment.” ~ Galatians 2:5
Paul gave to Timothy the following instructions:
1 I charge thee therefore before God, and the Lord Jesus Christ, who shall judge the quick and the dead at his appearing and his kingdom;
2 Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all long suffering and doctrine.
3 For the time will come when they will not endure sound doctrine; but after their own lusts shall they heap to themselves teachers, having itching ears… ~ 2 Timothy 4:1-3
Paul instructed Titus as well: A bishop (a Pastor) must hold fast to the faithful word as he hath been taught, that he may be able by sound doctrine both to exhort and to convince the gainsayers.” Titus 1:9
Paul then says:
10 For there are many unruly and vain talkers and deceivers, specially they of the circumcision:
11 Whose mouths must be stopped, who subvert whole houses, teaching things which they ought not, for filthy lucre’s sake.
Paul also instructed Titus to reject a man who is a heretic after the second admonition, because those who are heretics are subverted, and sinful, and condemned.” ~ See Titus 3:10-11
According to the apostle Peter, false teachers cause the way of the truth to be evil spoken of. ~ 2 Peter 2:2
Jude tells us to earnestly contend for the faith which was once delivered unto the saints and warns of ungodly men who creep in unawares and turn the grace of God into lasciviousness.
Peter describes false teachers by saying they are wells without water, clouds that are carried with a tempest; to whom the mist of darkness is reserved for ever. For when they speak great swelling words of vanity, they allure through the lusts of the flesh, through much wantonness, those that were clean escaped from them who live in error. While they promise them liberty, they themselves are the servants of corruption… ~ 2 Peter 2:17-19
Jude is just as harsh:
These are spots in your feasts of charity, when they feast with you, feeding themselves without fear: clouds they are without water, carried about of winds; trees whose fruit withereth, without fruit, twice dead, plucked up by the roots; Raging waves of the sea, foaming out their own shame; wandering stars, to whom is reserved the blackness of darkness for ever. ~ Jude 1:12-13
The apostle John, who wrote much about love and truth in his first epistle calls false ministers, liars and anti-Christs ~ 1 John 2:18-26, and says, they are of the world. ~ 1 John 4:1-5
In his second epistle, John refers to them as deceivers, and says not to have fellowship with them nor become partakers of their evil deeds by bidding them Godspeed. ~ 2 John 1:7-11
In the book of the Revelation, the apostle John was given a message of rebuke from Jesus for the church at Pergamos, because among them were those who held to the doctrine of Balaam, and some who held to the doctrine of the Nicolaitanes.
Jesus then adds regarding the doctrine of the Nicolaitanes: which thing I HATE. ~ Revelation 2:14-15
Jesus also rebuked the church at Thyatira because they were allowing a woman whom he referred to as Jezebel who called herself a prophetess, to teach and to seduce God’s servants to commit fornication, and to eat things sacrificed unto idols. ~ Revelation 2:20
There is more that can be said along these lines, and maybe I will address them at a later time. However, I have provided the references above as testimony from God’s word that false teacher, false ministers, and false doctrines are not to be tolerated; not even in the name of love.