Rom 11:1 I say then, Hath God cast away his people? God forbid. For I also am an Israelite, of the seed of Abraham, of the tribe of Benjamin.
Rom 11:2 God hath not cast away his people which he foreknew.
Rom 11:5 Even so then at this present time also there is a remnant according to the election of grace.
Jer 31:35 Thus saith the LORD, which giveth the sun for a light by day, and the ordinances of the moon and of the stars for a light by night, which divideth the sea when the waves thereof roar; The LORD of hosts is his name:
Jer 31:36 If those ordinances depart from before me, saith the LORD, then the seed of Israel also shall cease from being a nation before me for ever.
The majority of the Jews did not accept Christ, but God did not give up on them.
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.
I know people say apostasy but the Church is only people that act like Christ, and the gates of hell cannot prevail against the Church, so the Church can never fall away.
Mat 18:19 Again I say unto you, That if two of you shall agree on earth as touching any thing that they shall ask, it shall be done for them of my Father which is in heaven.
Mat 18:20 For where two or three are gathered together in my name, there am I in the midst of them.
If people leave the truth it has nothing to do with the Church it just means less people are abiding by the truth, or they left the Church, but God always has people in the truth like there is Jews that are in the truth.
The Church can never fall away, and even when the world accepts the New Age Christ the Church is still there for he blasphemes against God, and His tabernacle, which he would not have to do that if the saints are gone, for he is telling the people that their religion is false, and their God does not exist, and makes war against all people who keep the commandments of God, and the testimony of Jesus.
2Th 2:1 Now we beseech you, brethren, by the coming of our Lord Jesus Christ, and by our gathering together unto him,
2Th 2:2 That ye be not soon shaken in mind, or be troubled, neither by spirit, nor by word, nor by letter as from us, as that the day of Christ is at hand.
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 falling away has to do with the condition of the world in response to the Gospel, which the nations governments came together as one to work for peace on earth, and they stopped the preaching of the Gospel worldwide saying it is not the truth, and they want peace not division.
Which will lead to the transgressors coming to the full, the falling away, for the world is not accepting the Gospel to be preached, and then a king of fierce countenance, and understanding dark sentences shall stand up, for the sin condition of the world caused it to happen.
As long as one nation allows the preaching of the Gospel then the world would never rebel against God, but the nations governments came together as one and stopped it being preached, and international law not to preach the Gospel, and the world embraced the new age movement that interprets all religions as evolution is religion, and they are still evolving, and no God, which is what caused the religion of Islam to rebel against the world for they stopped the spreading of Islam, although the Arab governments went along with the other nations.
The Church can never fall away, and the falling away is the condition of the world in response to the Gospel, and the New Age Christ kingdom took away the hope of the world, and they made war against the saints, so it is over and God will put the world down.