From my studies there are three groups which will go through the tribulation.

• The Lost
• Israel who depend on the Torah without His Spirit
• Tribulation Saints who know the Gospel but have ignored our Father and His Spirit

Israel who solely depend the Torah is also known as The Bride are destined to run to a place prepared for them when the antichrist is revealed and hidden away until the end.

Matthew 24:15-17 The Great Tribulation
“Therefore when you see the ‘abomination of desolation,’ spoken of by Daniel the prophet, standing in the holy place” (whoever reads, let him understand), “then let those who are in Judea flee to the mountains. Let him who is on the housetop not go down to take anything out of his house.

The Tribulation Saints will suffer much persecution but have a change of heart and put their trust in our Father either in death or make it to the end. These will also be saved out of our Father's judgement which is reserved for the wicked.

Although the tribulation saints know the Gospel of salvation they are not included in the raptured body of Christ because they did not accept His Spirit and trusted more in themselves.

Jude 1:19 These are sensual persons, who cause divisions, not having the Spirit.

Rev 3:16-17 So then, because you are lukewarm, and neither cold nor hot, I will vomit you out of My mouth. Because you say, ‘I am rich, have become wealthy, and have need of nothing’

They have a change of heart seeing that they can no longer depend on themselves.

Rev 12:16-17 But the earth helped the woman [Israel who escaped to the hills], and the earth opened its mouth and swallowed up the flood which the dragon had spewed out of his mouth. And the dragon was enraged with the woman, and he went to make war with the rest of her offspring [tribulation saints], who keep the commandments of God and have the testimony of Jesus Christ.

The lost

2 Thessalonians 2:9-12 The coming of the lawless one is according to the working of Satan, with all power, signs, and lying wonders, and with all unrighteous deception among those who perish, because they did not receive the love of the truth, that they might be saved. And for this reason God will send them strong delusion, that they should believe the lie, that they all may be condemned who did not believe the truth but had pleasure in unrighteousness.