And we know everyman individually is not Justified !
Not everyone is justified - yet! John 12:46-48 (WEB):
(46) I have come as a light into the world, that whoever believes in me may not remain in the darkness.
(47) If anyone listens to my sayings, and doesn’t believe, I don’t judge him. For I came not to judge the world, but to save the world.
(48) He who rejects me, and doesn’t receive my sayings, has one who judges him. The word that I spoke, the same will judge him in the last day.
Christians are justified before they die because God has worked in them to draw them to belief in Jesus - John 6:44 (WEB):
(44) No one can come to me unless the Father who sent me draws him, and I will raise him up in the last day.
This is not their doing that they can boast about, but it is a gift from God - Ephesians 2:8-9 (WEB):
(8) for by grace you have been saved through faith, and that not of yourselves; it is the gift of God,
(9) not of works, that no one would boast.
Those that God does not draw to belief and faith in Jesus in this life, are still saved from death by Jesus' sacrifice, and they will be resurrected to life (human life, on the earth) at the beginning of Jesus' 1,000 years reign on the earth. Then they will be brought to belief and faith in Jesus and God. As Jesus said, the same word that he spoke during his earthly ministry will be what will judge those people - if they believe and remain faithful then they will be granted eternal life; if they don't remain faithful and instead they side with Satan, then they will be punished with the second death (which is eternal because there will not be another resurrection).
So Christians have their trial of faith in their earthly lives, when it is more difficult - the narrow, more difficult to enter way - Matthew 7:13-14 (WEB):
(13) “Enter in by the narrow gate; for wide is the gate and broad is the way that leads to destruction, and many are those who enter in by it.
(14) How narrow is the gate, and restricted is the way that leads to life! Few are those who find it.
Therefore Christians, if they remain faithful until their death, after their resurrection have already gained eternal life - Revelation 20:6 (WEB):
(6) Blessed and holy is he who has part in the first resurrection. Over these, the second death has no power, but they will be priests of God and of Christ, and will reign with him one thousand years.
The rest of mankind have an easier trial during the 1,000 years reign - Isaiah 35:8-10 (WEB):
(8) A highway will be there, a road, and it will be called The Holy Way. The unclean shall not pass over it, but it will be for those who walk in the Way. Wicked fools will not go there.
(9) No lion will be there, nor will any ravenous animal go up on it. They will not be found there; but the redeemed will walk there.
(10) Then Yahweh’s ransomed ones will return, and come with singing to Zion; and everlasting joy will be on their heads. They will obtain gladness and joy, and sorrow and sighing will flee away.”
At the end of the 1,000 years reign Satan is released to test the rest of mankind - Revelation 20:7-8 (WEB):
(7) And after the thousand years, Satan will be released from his prison,
(8) and he will come out to deceive the nations which are in the four corners of the earth, Gog and Magog, to gather them together to the war; the number of whom is as the sand of the sea.
Those that fail this test and side with Satan will perish - Revelation 20:9 (WEB):
(9) They went up over the width of the earth, and surrounded the camp of the saints, and the beloved city. Fire came down out of heaven from
God and
devoured them.
Those that pass this final test will be justified and be granted eternal life.
Acts 13:38-39 (WEB):
(38) Be it known to you therefore, brothers, that through this man is proclaimed to you remission of sins,
(39) and by him everyone who believes is justified from all things, from which you could not be justified by the law of Moses.
Everyone who believes is justified and will have eternal life, whether they believe and become Christians before they die, or whether they believe after they have been resurrected. Only the eternal reward differs - Christians being granted a better resurrection as part of a new spiritual creation, joint heirs with Jesus, adopted as sons of God with homes in God's house (John 14:2 - "In my Father’s house are many homes. If it weren’t so, I would have told you. I am going to prepare a place for you"); the rest of mankind will live on the earth, which will be restored to the original paradise like the garden of Eden.