Some have claimed that all people will be finally saved, even after torment in hell. However, there are all sorts of inherent problems with that view. Here’s a brief list of problems to consider.
1. There Is No (Clear) Scripture That Teaches Universalism
The doctrine of universalism goes against the clear teaching of Scripture and finds no clear teaching supporting what it argues. Yes, I understand that there are a few passages that if you pull out of context and place into a certain system of thought, can seem to support the doctrine but it is not the texts natural meaning in context.
Jesus and Jihad
I talked to a Muslim friend recently that said Islam and Christianity are ninety-six percent the same. I strongly disagree with him and believe most informed Muslims would as well. There is an irrevocable difference between Christianity and Islam. Some Christian missionaries go and die if need be, whereas some Muslim “missionaries” go and kill if need be. This is because Jesus died and said take up your crosses whereas Muhammad killed and said take up your swords. Jesus promises salvation through justification; Muhammad claims it comes through jihad.
It is important to understand that Jesus (Isa in the Qur’an) is quite prominent in the Qur’an and is held to be a prophet. The Qur’an assumes that its readers will have a working knowledge of Jesus and His teaching (cf. Surah 2:136; 4:29; 5:46). Islam even teaches that Jesus will return and carry out justice and “break the cross.” However, there is a very large contrast between what the Qur’an teaches about religious use of violence and what Jesus teaches on violence. So, let’s look at what Jesus has to say about violence.
What we do in this current life has an eternal impact. The New Testament insists on the decisiveness of this life. In the early church, the “idea that the coming judgment will be based on deeds done in this life was widespread.” For example, “Do not fear those who kill the body but cannot kill the soul. Rather fear him who can destroy both soul and body in hell” (Matt. 10:28).
All through Scripture it talks about the Day of the LORD (sg.). The Bible does not talk about judgments starting at the Great White Throne Judgment (Rev. 20:11ff) and going from there on into eternity where people have multiple chances to repent. That’s why it says, “Behold [ἰδοὺ], now [νῦν] is the day of salvation” (2 Cor. 6:2; cf. Ps. 32:6; Is. 55:6). Acts 17:31 says God “has fixed a day [sg.] on which He will judge the world in righteousness by a man whom He has appointed; and of this He has given assurance to all by raising Him [i.e. Jesus] from the dead.” Hebrews says, “it is appointed for man to die once, and after that comes judgment [sg.]” (9:27). Thus in Scripture, we do not see that people can repent after the Judgment. Actually to get the idea of repentance after the Judgment you would have to add to Scripture. Yet, listen to Revelation: “I warn everyone who hears the words of the prophecy of this book: if anyone adds to them, God will add to him the plagues described in this book, and if anyone takes away from the words of the book of this prophecy, God will take away his share in the tree of life and in the holy city, which are described in this book” (22:18-19).
The goal here is not to give an exhaustive commentary on each passage but merely to show that there are very viable interpretations that are faithful to the whole of Scripture and do not lead to universalism.
“Turn to me and be saved, all the ends of the earth! For I am God, and there is no other.  By myself I have sworn; from my mouth has gone out in righteousness a word that shall not return: ‘To me every knee shall bow, every tongue shall swear allegiance.’”
In the LXX (the Greek translation of the Old Testament) απιστραϕητε is an imperative and means “turn around.” It has to do with changing ones beliefs and ways. It translates the Hebrew word (פָּנָה) meaning “turn” which is also in the imperative. So God here is not asking people to turn to Him, He’s commanding it. And it says that all people (from the farthest stretches of the earth) who turn to Him will be saved. But it implies that all who don’t turn to Him (in space in time before the Judgment) will not be saved. So we see precedence for “all” being saved here, that is, if any turn to the Lord from all over the earth they will be saved. Whosoever believes will be saved, Jew or Gentile. It was (in the OT and NT) an amazing thing for Paul for example that Gentiles can now be welcomed in (he called it a mystery). All the uncircumcised, the Egyptians that enslaved Israel, the Babylonians, all people that turn to the Lord (in space in time before the Judgment) will be saved. They will be saved from the terror of the Messiah’s Second Coming and the Final Destruction.
In the context, this passage would strike fear into the hearers, not comfort. This passage is saying, “repent and turn or else!” Further, v. 25 says “all the offspring of Israel shall be justified,” i.e. all those who have faith (see e.g. Rom. 2:28-29; 4:1-16; 9:6), not all without exception. “Yahweh’s speech ends with a prediction of destructive fire for those who do not submit to his reality and reign (Isa 47:14-15)… There is voluntary submission for some and involuntary submission for others.”
When we interpret “forever” in English, as well as in Greek, context is king. For example, when someone gets back from the DMV and says to us, “that took forever,” what do we interpret that phrase to mean? We take a number of things into account in our interpretation. We understand that it takes a relatively long time at the DMV and we understand that people very often joke about how long it takes at the DMV. We also take into account that the person is standing in front of us saying, “that took forever” which clearly demonstrates that it did not in fact literally take forever.
The person that said “forever” was using it as an expression for “a long time.” However, if that same person said, “God is forever” we would understand that we need to interpret that “forever” differently. Why? Because context is king. And context is telling us that the referent in this case is “God,” not the DMV, and that fact changes the meaning of the word “forever.”
The Bible tells us that certain things are eternal/everlasting. For instance, God is eternal (Rev. 4:9-10), Jesus is alive forevermore (Rev. 1:18), heaven is eternal (Jn. 3:16), and judgment in hell is eternal. If we say judgment in hell is not eternal then we lose grounds for saying that God, Jesus, and heaven are eternal since the same words are explicitly and very intentionally used to express the eternity of each subject under question (and the eternality of hell and heaven are even paralleled in Matthew 25:46).
All throughout the Bible, from Genesis to Revelation, we see two distinct groups. God has called particular people from all nations. As James Hamilton has said, “People are either seed of the serpent, on the side of the snake in the garden, or seed of the woman, on the side of God and trusting in his promises.”
The careful reader of Scripture can see the enmity between the two seeds in Genesis and in fact through the whole Old Testament. There are physical decedents of Eve that are spiritually seed of the serpent. This is not just something we see in the Old Testament though. We see it through the whole of Scripture (cf. e.g. Matt. 13:38; Jn. 8:44; 1 Jn. 3:8). We see two distinct seeds with two distinct ends from the beginning of Genesis (cf. esp. Gen. 3:15) to the end of Revelation (cf. e.g. Rev. 21).
Notice that in 2 Thessalonians 1:7-10 there are two groups: 1) those who did not believe and thus receive judgment and 2) those who do believe and thus enjoy the presence of God and marvel at Him. And notice Jesus separates the goats from the sheep based on what they did in their earthly lives (Matt. 25:32ff). People are gravely either goat or sheep, wise or fool, darkness or light, faithful or faithless, in Christ or damned.
As I have said, the Bible shows to different humanities, one lost and the other saved, one in heaven and one in hell. This is what we see throughout the story of Scripture and this is what we see reflected in other places in the early church’s teaching. For instance, the Didache (50-120AD) says, “There are two ways, one of life and one of death, and there is a great difference between the two ways” (1:1).