The church are his chosen children who follow the Lord, I agree with your your summary.

I think there will be members of different denominations who will be saved at the end, but it's important just to follow biblical teachings and not teachings of a denomination which disagree with God's word.

False Teachings and their specific message:

Catholicism, the faith to a church which is free to change God's word in his name (hashtag:synods), traditions which are more important as the Bible, holy ones.

Calvinism, the faith humans don't have a free will to choose, predestination.

Cessationism, the faith to the end of God's gifts/aptitudes for his followers.

If you're saved, there's no danger to secede although the Bible tells you can and prophesied the big falling off more often (Hebrews 6:4-6, Matthew 12:31-32, Hebrews 10:26-27, 2. Thessalonians 2:3, 1. Timothy 4:1).

Evangelic, infant baptism can save humans, to be a Christian who goes to the church and belief what this humanly institution says is enough.

The prayer of a sinner, it's enough to accept Jesus Christ as your savior, but there's no necessary to repent and to follow the Lord although the bible clearly sais it is necessary (Pete 2:38, Matthew 28:19).

Prosperity Gospel, wealthiness and prosperousness as opposed to the persecution of Christians which was prophesied by the Lord Jesus Christ (John 15:18-20).

Hyper Grace, Forgiveness for all sins, these ones which you make in future too, so it's not necessary to repent after you've sinned.

A falsified Gospel for good feelings in this limited existence, faith is enough, to be a follower of the Lord can to mean an easy life here on earth although the Bible say other things (Matthew 25;41-46).

Kundalini Congregations, just experiences and feelings are important.

Final Reconciliation (Universal Salvation), we all come to God at the end, all sins are forgiven and it doesn't no matter the bible talks about Judgement Day, Punishment for God's enemies and so on (2. Thessalonians 1:7-9, Hebrews 10:31. Matthew 25:41-46, Mark 9:42-47).

Esoterism, happyness and freedom without God.

Humanism, Humans are good, it's the world which make them bad, so humans can be good without Jesus Christ (with other words:Be your own God, that's the same what modern Satanism says too).

Jehovah's Witness, Adventists, there is no hell although the Bible tells more often from this place and although Jesus Christ told his disciples from this place too (Matthew 25:41-46).