This is false because the falling away in the church is exactly christians being deceived & never coming back.
That's not to say all of them will do that, just proving the Bible says otherwise.
2Thess 2:3 English Standard Version
Let no one deceive you in any way. For that day will not come, unless the rebellion comes first, and the man of lawlessness is revealed, the son of destruction,
https://www.gotquestions.org/great-apostasy.html
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.
This is not concerning the Church,for the Church cannot fall away.
Mat 16:18 And I say also unto thee, That thou art Peter, and upon this rock I will build my church; and the gates of hell shall not prevail against it.
Mat 24:50 The lord of that servant shall come in a day when he looketh not for him, and in an hour that he is not aware of,
Mat 24:51 And shall cut him asunder, and appoint him his portion with the hypocrites: there shall be weeping and gnashing of teeth.
2Ti 2:19 Nevertheless the foundation of God standeth sure, having this seal, The Lord knoweth them that are his. And, Let every one that nameth the name of Christ depart from iniquity.
2Ti 2:20 But in a great house there are not only vessels of gold and of silver, but also of wood and of earth; and some to honour, and some to dishonour.
2Ti 2:21 If a man therefore purge himself from these, he shall be a vessel unto honour, sanctified, and meet for the master's use, and prepared unto every good work.
The gates of hell cannot prevail against the Church,and hypocrites do not belong to the Church.
So the only people that can belong to the Church is people that act like Christ led of the Spirit,therefore the Church can never fall away.
There may not be as many that belong to the Church,because of hypocrisy,but the Church can never fall away,for the gates of hell cannot prevail against it,and hypocrites do not belong to the Church,so it is only contains people who act like Christ led by the Spirit.
The Church is blameless,flawless,and without spot,and wrinkle,and is always like that,because hypocrites do not belong to the Church,although they can come to the physical building,but their bad actions does not reflect on Christianity,for they do not belong to the Church.
The falling away first is the condition of the world in response to the Gospel,that they are not allowing it to be preached on a world wide level,when the nations come together and say Peace and safety,and have a unified religious system based on the occult,and evolution,and people can still evolve through the power of nature,and anybody that tries to convert someone to a belief contrary to that will be guilty of a hate crime punishable in the international criminal court system,and Christianity will rapidly decline in impacting the world with the truth,
Which will pace the way for the man of sin to claim to be God,and the beast kingdom.
Which the saints cannot be gathered unto Christ until there is a falling away first,which the unified religious system will operate for three and one half years,and they have hindered the Christians from preaching the Gospel,and the ten horn kingdom,one world government failed at obtaining peace on earth,so the world turns to the man of sin,and the falling away has happened,in which the transgressors have come to the full,and then a king of fierce countenance,and understanding dark sentences will stand up and deceive all people who do not love God to follow the beast kingdom.
The beginning of the end.
Ti 4:1 Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils;
1Ti 4:2 Speaking lies in hypocrisy; having their conscience seared with a hot iron;
1Ti 4:3 Forbidding to marry, and commanding to abstain from meats, which God hath created to be received with thanksgiving of them which believe and know the truth.
1Ti 4:4 For every creature of God is good, and nothing to be refused, if it be received with thanksgiving:
1Ti 4:5 For it is sanctified by the word of God and prayer.
God warns the saints of the new age movement and their interpretation of the Bible based on the occult,nature worship,witchcraft,spiritual evolution through nature,and people can still evolve,and Jesus is not Lord and Savior,but a good teacher in spiritual enlightenment,and an ascended master,and avatar,and does not acknowledge a personal God,but honors the God of forces,or the power of nature as their higher power.
Which the Bible says the little horn,man of sin,beast,New Age Christ,will display the ways of the new age movement,for he will be in to the occult,nature worship,will cause craft to prosper on earth,witchcraft,that does not acknowledge the God of his fathers,and does not regard any god,but in his estate he will honor the God of forces,or a God his fathers knew not,and will convince the world that he harnessed the power of nature,and obtained power,evolved,and the false prophet will do miracles in the sight of people to convince them that the beast did obtain power through nature,and shared this power with the false prophet,and the beast will give this power to all who follow him.
But the Bible says they are lying miracles,and wonders,so the devil will falseify them somehow,and he will deceive all people who do not love God for He is allowing it for it is time to end this sin business on earth.
Alice Bailey,the biggest prophet of the new age movement,and wrote many books concerning it,and basically the blueprint of the movement,speaking of the coming one world government,one world religious system,and the New Age Christ,interpreted the Bible according to the occult,and evolution,and people can still evolve,which she believed Lucifer was a solar angel,and the fall of Lucifer in Isaiah 14 was not a fall in to sin and disgrace,but a sacrifice,and he descended from Venus,thus the fall,to bring the principle of mind to the then animal-man,and in the future will cause people to evolve through the power of nature.
They will forbid to marry between a man and a woman for population reduction,which will be international law one day,as they will want to care about the planet and the over population of it,and command to abstain from meats,for they worship nature,and are in to evolution.
2Ti 4:2 Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all longsuffering and doctrine.
2Ti 4:3 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;
2Ti 4:4 And they shall turn away their ears from the truth, and shall be turned unto fables.
The new age movement is the future for this sinful world,and will develop in to a unified religious system based on evolution,and people can still evolve,and any person that teaches contrary to that will be guilty of a hate crime punishable in the international criminal court system,and Christianity will rapidly decline in impacting the world with the truth.
The time will come when the world will not want to hear the Bible according to what has been preached for thousands of years,but will only want to hear it according to the new age movement,which people will be more selfish,arrogant,and self exalting,at that time,which Jesus said since iniquity shall abound the love of many shall wax cold,and Paul said evil men and seducers shall wax worse and worse,deceiving and being deceived,and the last days people will be without natural affection,and covetous,and the last generation the children will not want to obey their parents,and people will be highly selfish,highly arrogant,and aggressive towards each other not caring too much about the feelings of others,and will devour the poor from off the earth,and the needy from among men,for they will be so obsessed with money to exalt themselves that they will not care about those in need.
The Bible says the saints cannot be gathered unto Christ until there is a falling away first,and the man of sin claims to be God to the world.
The falling away has nothing to do with the Church,but the condition of the world in response to the Gospel,having an occult interpretation of the Bible.
These people have nothing to so with the Church but the unified religious system based on evolution and all religions based on evolution.