This is because generally false doctrine and false teachers are not refuted in the Church System.
Have you ever heard a pastor quote this and elaborate on it?
Act 20:25 And now, behold, I know that ye all, among whom I have gone preaching the kingdom of God, shall see my face no more.
Act 20:26 Wherefore I take you to record this day, that I am pure from the blood of all men.
Act 20:27 For I have not shunned to declare unto you all the counsel of God.
Act 20:28 Take heed therefore unto yourselves, and to all the flock, over the which the Holy Ghost hath made you overseers, to feed the church of God, which he hath purchased with his own blood.
Act 20:29 For I know this, that after my departing shall grievous wolves enter in among you, not sparing the flock.
Act 20:30 Also of your own selves shall men arise, speaking perverse things, to draw away disciples after them.
Act 20:31 Therefore watch, and remember, that by the space of three years I ceased not to warn every one night and day with tears.
Have you ever seen a pastor warning his flock everyday with tears about the wolves who appear as lambs?
The truth is people don't take deception seriously. They look at the Mormon's, Jehovah's Witnesses, Atheists, Moonies, Scientology etc. as the deceived one's. Few people seriously consider the warning of Paul.
The wolves are in the pulpits today and they "appear" as "Ministers of Righteousness."
2Co 11:13 For such are false apostles, deceitful workers, transforming themselves into the apostles of Christ.
2Co 11:14 And no marvel; for Satan himself is transformed into an angel of light.
2Co 11:15 Therefore it is no great thing if his ministers also be transformed as the ministers of righteousness; whose end shall be according to their works.
Transform - G3345 - metaschēmatizō
From G3326 and a derivative of G4976; to transfigure or disguise; figuratively to apply (by accommodation): - transfer, transform (self).
Right after Jesus taught that "strait is the gate and narrow is the way and that FEW will find it" Jesus warned about the wolves who would come, MULTITUDES of them.
Mat 7:15 Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves.
Jesus taught that MANY would come in His (Jesus) name and say that He was the Christ and would deceive MANY.
Mat 24:4 And Jesus answered and said unto them, Take heed that no man deceive you.
Mat 24:5 For many shall come in my name, saying, I am Christ; and shall deceive many.
Not deceive a few, deceive many. A multitude.
Jesus even taught how to identify them...
Mat 7:16 Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?
Mat 7:17 Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit.
Mat 7:18 A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.
Mat 7:19 Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
Mat 7:20 Wherefore by their fruits ye shall know them.
Jesus taught you will know them by what they produce. They produce converts. What is the fruit within the Church System today? I see SIN SIN SIN. I see professing Christian's who argue in favour of perpetually sinning till death every single day. Professing Christian's who STILL WORK INIQUITY.
Jesus went on to say...
Mat 7:21 Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven.
Mat 7:22 Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works?
Mat 7:23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
Not a FEW but MANY. MANY MANY MANY. A multitude of people.
If one is to preach today that one MUST depart from iniquity one will be refuted with all manner of excuses. "you are saving yourself," "you are self-righteous," "you are saying we don't need Jesus," "it's not of works," "faith alone," "1Joh 1:8 teaches we cannot stop sinning," "Romans 7:14-28 teaches we will always be doing wrong," "Paul was the chief of sinners." All defending an ongoing state of sinfulness, all defending an ongoing state of working iniquity.
In Revelation chapters 2 and 3 there are seven churches listed. FIVE out of SEVEN had already been corrupted back then. That is MOST of the Churches John was writing to.
What is it today?
Don't be deceived folks. Paul warned abut what would happen...
2Th 2:3 Let no man deceive you by any means: for that day shall not come, except there come a falling away first, and that man of sin be revealed, the son of perdition;
2Th 2:4 Who opposeth and exalteth himself above all that is called God, or that is worshipped; so that he as God sitteth in the temple of God, shewing himself that he is God.
2Th 2:5 Remember ye not, that, when I was yet with you, I told you these things?
2Th 2:6 And now ye know what withholdeth that he might be revealed in his time.
2Th 2:7 For the mystery of iniquity doth already work: only he who now letteth will let, until he be taken out of the way.
2Th 2:8 And then shall that Wicked be revealed, whom the Lord shall consume with the spirit of his mouth, and shall destroy with the brightness of his coming:
2Th 2:9 Even him, whose coming is after the working of Satan with all power and signs and lying wonders,
2Th 2:10 And with all deceivableness of unrighteousness in them that perish; because they received not the love of the truth, that they might be saved.
2Th 2:11 And for this cause God shall send them strong delusion, that they should believe a lie:
2Th 2:12 That they all might be damned who believed not the truth, but had pleasure in unrighteousness.
In order to not be deceived one must LOVE the truth. If one is complacent about the truth they WILL BE DECEIVED. God Himself sends STRONG DELUSION.