The only problem with Hell is Christians not knowing what they hell they are talking about
Elect not saved in this life, rise from Hell to be saved in the Day of the LORD Jesus, Judgment Day. Only the Children of the Devil are lost.
Hell is God doing what murmurers always claimed God should do, make it completely clear what the consequences are.
Hell is God going the extra mile, trying to save all.
11 And I saw a great white throne, and him that sat on it, from whose face the earth and the heaven fled away; and there was found no place for them.
12 And I saw the dead, small and great, stand before God; and the books were opened: and another book was opened, which is the book of life: and the dead were judged out of those things which were written in the books, according to their works.
13 And the sea gave up the dead which were in it; and death and hell delivered up the dead which were in them: and they were judged every man according to their works.
14 And death and hell were cast into the lake of fire. This is the second death.
15 And whosoever was not found written in the book of life was cast into the lake of fire.
(Rev 20:11-15 KJV)
"The earth and heaven fled away" uncovering both men and angels, compare "heaven departed as a scroll when it is rolled together...And the kings of the earth...hid...and said to the mountains and rocks...hide us from the face of him that sitteth on the throne."-(Rev 6:14-17 KJV)
This is the final judgment of men and angels. From the Sea, where the gate of Tartarus lay, rise the angelic "sons of God" who were seduced by the daughters of wicked men under the command of Satan's angels the Nephilim (Gen 6:1-7; 2 Pet 2:4; Jude 1:6). While these had not joined Satan's rebellion, they corrupted the image of God in man with angelic DNA, meriting eternal punishment albeit not as severe at what will be meted out to Satan and his angels. These are punished with eternal darkness and bonds, unlike Satan and his angels who will be driven uncontrollably into the Lake of Fire while imprisoned in swine flesh that communicates the undiluted wrath of our Holy God. Weeping and gnashing of teeth is indicative of intense physical pain like that of a burning fire or devouring worm. (Mark 5:9) They won't be tormenting anyone in Gehenna, they can't even move to lessen their torment.
Both good and bad rise up from Death and Hades, the Elect and the non-Elect:
31 The queen of the south shall rise up in the judgment with the men of this generation, and condemn them: for she came from the utmost parts of the earth to hear the wisdom of Solomon; and, behold, a greater than Solomon is here.
32 The men of Nineve shall rise up in the judgment with this generation, and shall condemn it: for they repented at the preaching of Jonas; and, behold, a greater than Jonas is here.
(Luk 11:31-32 KJV)
Those who obeyed Christ's voice in the grave (John 5:25-29; 1 Peter 3:18-19) or the gospel they heard when alive (1 Peter 4:6) and repent living "according to God in the spirit" while waiting for the resurrection in Hades, rise into life. They are saved in "the Day of the Lord Jesus" (1 Corinthians 5:5) because their names were written in the "Book of life of the Lamb" (Rev 13:8) before the founding of the world (Eph 1:3-5) but like the Pharisee (Luke 16:22ff)---an Elect or child of Abraham (Luke 16:24-25), had died without Christ and therefore had to pay for their sins in Hades (Luke 16:26; Acts 4:12) while they waited to be resurrected on Judgment Day.
ONLY those not written in the Lamb's book of life fail to repent in Hell, are raised up in contemptible bodies (Dan 12:1-3) and cast into the Lake of Fire, which symbolizes BOTH eternal separation from God (2 Thess 1:9) and a terrible place of torment as in a burning furnace of fire (Mat 13:41-42, 49-50), the contemptible bodies communicating this to the souls and spirits trapped with in them, so intensely they can only wail and gnash their teeth (Mark 9:43-48).
BECAUSE Gehenna, the Lake of Fire, is so terrible, Hades or Hell is proof of God's love, it guarantees all understand the consequences of remaining defiled by evil, and so unable to live in the presence of our Holy God.
Only the children of the Devil end up in Gehenna, Hell proved they belong there. Regardless how God tried to sway them, they refused to repent and so were cast into the lake of fire.
Not one of God's children, all He foreknew are His, failed to repent, either in this life (who become kings and priests in Christ's millennial kingdom (Rev 20:6), or in Hades.
Had God not made sure those He foreknew wouldn't be lost (Rom 8:28-39), He would have mourned them for all eternity:'
For this purpose the Son of God was manifested, that he might destroy the works of the devil. (1Jo 3:8 KJV)
So all Israel is saved, and all the Devil's children are lost:
26 And so all Israel shall be saved: as it is written, There shall come out of Sion the Deliverer, and shall turn away ungodliness from Jacob:
27 For this is my covenant unto them, when I shall take away their sins.
28 As concerning the gospel, they are enemies for your sakes: but as touching the election, they are beloved for the fathers' sakes.
29 For the gifts and calling of God are without repentance.
30 For as ye in times past have not believed God, yet have now obtained mercy through their unbelief:
31 Even so have these also now not believed, that through your mercy they also may obtain mercy.
32 For God hath concluded them all in unbelief, that he might have mercy upon all.
33 O the depth of the riches both of the wisdom and knowledge of God! how unsearchable are his judgments, and his ways past finding out!
34 For who hath known the mind of the Lord? or who hath been his counsellor?
35 Or who hath first given to him, and it shall be recompensed unto him again?
36 For of him, and through him, and to him, are all things: to whom be glory for ever. Amen. (Rom 11:26-36 KJV)
"might have mercy on all the elect who died in disbelief", not "all mankind." Satan, his angels, and all his children, their part shall be in the lake which burns with fire an sulphur.
20 But the wicked are like the troubled sea, when it cannot rest, whose waters cast up mire and dirt.
21 There is no peace, saith my God, to the wicked. (Isa 57:20-21 KJV)
20 Behold, I stand at the door, and knock: if any man hear my voice, and open the door, I will come in to him, and will sup with him, and he with me.
21 To him that overcometh will I grant to sit with me in my throne, even as I also overcame, and am set down with my Father in his throne.
22 He that hath an ear, let him hear what the Spirit saith unto the churches. (Rev 3:20-1 KJV)