God's judgement is only ever righteous judgment. It is the consequences of God's judgment that you ask about, but until the fact that God is utterly righteous in all his ways (including in his judgments) is understood, there can be no understanding of the consequences of his judgment.
God will "judge the world in righteousness" (Acts 17:3 & Psalm 9:8). Christians know that "in the gospel is the righteousness of God revealed... the righteousness of God without the law is [shown] ...even the righteousness of God which is by faith of Jesus Christ... faith in his blood to declare God's righteousness" (Romans 1:17, 3:21-22 & 25).
This is why Christianity is unique in its presentation of God's righteous judgment. Until people see how God publicly displayed his righteous judgment of sin by his wrath being poured out on his sinless Son, so that we could be cleansed from our sin, there can be no understanding of the righteous outcome of God's individual judgments on people. Whether they are granted unmerited bliss in heaven for eternity in God's holy presence, or kept outside of his presence (which will be hell), either way, that will be the right outcome.
None of that is relevant to other world faiths, because they always look at the matter from the human standpoint - not God's. They weigh matters as if they were the Judge and the jury, and declare what they think God ought to do. That is why what God has declared he will do shocks billions of people. Some even take offense at God - the very idea that he would even allow a place like hell to exist horrifies them.
The idea of heaven or hell as the only two possible eternal outcomes strikes them as extreme (unbalanced, in other words) because if they had a say in the matter, there should be interim 'stages' and second (or third or more) chances to work one's way up to heaven, eventually. "If at first you don't succeed, try, try, try again" seems to be the human idea. But that idea is based on the sinful human notion that sin isn't really that bad, well, not most sin anyway. Surely God could wink at some sin?
Well, reflection upon what the Son of God had to endure so that God could deal righteously with sin, in one fell swoop of his sword of judgment on the sinless One, should disabuse us of that idea. It should get us down on our knees in horror at sin, at our own total unworthiness to be forgiven, to cling to the foot of the now empty cross and plead in the name of the only Mediator God has appointed to bring sinners to God - Jesus Christ.
Once we admit the truth that "All have sinned and fallen short of the glory of God" (Romans 3:23) and that "in my flesh dwelleth no good thing" (Romans 7:18) - applying that personally - then we will begin to understand why the consequences of God's righteous judgment can only have two permanent outcomes.
Conclusion: Only once we understand the basis of God's judgment on humanity can we see why there are only those two eternal outcomes. Once we see the consistency of God's judgments and how that will apply to the final judgment of all the living, and all the resurrected dead, will we agree with the cry of his people in the revelation of that Day of Judgment:
"Alleluia; Salvation, and glory, and honour, and power unto the Lord
our God. For true and righteous are his judgments: for he hath judged
the great whore, which did corrupt the earth with her fornication, and
hath avenged the blood of his servants at her hand. And again they
said, Alleluia. And her smoke rose up for ever and ever." Revelation
19:1-3 & 11 A.V.