I haven't done a detailed study on this, but going by my recollection, and just checking a couple of online articles, the Book of Acts, and indeed the Epistles, go very soft on the concept of Hell. Paul speaks of the judgment to come, when speaking to the Athenians at Acts 17. There are some mentions of wrath in the book as well. 2Peter even gets quite graphic about elements melting with intense heat. But these cannot be tied directly to the historic post-NT concept of Hell that the church developed.
The words of Jesus lend themselves more toward that concept. But even there, there is room for disagreement about the eternal nature of the punishment.
If the Bible is soft or ambiguous on something, I'm not clear why we should make it an obligatory part of the faith, or why it should be so featured in our pronouncements of the Good News. Does hellfire get people to the front rail at church? It can. Are those true conversions or superficial manipulations? It could be either. Is that kind of preaching an accurate and balanced representation of the nature of God? Maybe, but it's very easy to take it out of line.
I personally don't have a conviction about the exact nature of Hell. And I'm ok with that (and I don't have a special interest in who Athanasius was), because knowing the wrath of God is coming is enough for me. I know God is just and must punish sin; indeed, that is why Christ had to die to take away ours. I would be comfortable citing that justice and wrath when presenting the Good News, because it is an organic part of the message, and I have the preaching of the Apostles to back that up (Jude tell us to "save some through fear"). But I normally would go no further than that.
When I see creedal issues like this one I am reminded that there is no safety in the church or in church history. Only genuine trust in Christ for salvation will keep one's soul when the judgment comes.
I have done a fairly thorough study of hell. Some folks want to argue that the concept of hell came from pagan Greeks.
…..According to three irrefutable Jewish sources; the Jewish Encyclopedia, Encyclopedia Judaica and the Talmud, quoted below, among the Jews in Israel before and during the time of Jesus there was a belief in a place of everlasting torment of the wicked and they called it both sheol and gehinnom.
…..There were different groups within Judaism; Sadducees, Pharisees, Essenes etc. and there were different beliefs about resurrection, hell etc. That there were differing beliefs does not rebut, refute, change or disprove anything in this post.
Jewish Encyclopedia, Gehenna
The place where children were sacrificed to the god Moloch … in the "valley of the son of Hinnom," to the south of Jerusalem (Josh. xv. 8, passim; II Kings xxiii. 10; Jer. ii. 23; vii. 31-32; xix. 6, 13-14). … the valley was deemed to be accursed, and "Gehenna" therefore soon became a figurative equivalent for "hell." Hell, like paradise, was created by God (Sotah 22a);
[Note, this is according to the ancient Jews, long before the Christian era, NOT supposed bias of Christian translators. DA]
(I)n general …sinners go to hell immediately after their death. The famous teacher Johanan b. Zakkai wept before his death because he did not know whether he would go to paradise or to hell (Ber. 28b). The pious go to paradise, and sinners to hell(B.M. 83b).
But as regards the heretics, etc., and Jeroboam, Nebat's son, hell shall pass away, but they shall not pass away" (R. H. 17a; comp. Shab. 33b). All that descend into Gehenna shall come up again, with the exception of three classes of men: those who have committed adultery, or shamed their neighbors, or vilified them (B. M. 58b).[/i]
… heretics and the Roman oppressors go to Gehenna, and the same fate awaits the Persians, the oppressors of the Babylonian Jews (Ber. 8b). When Nebuchadnezzar descended into hell, [ שׁאול /Sheol]] all its inhabitants were afraid that he was coming to rule over them (Shab. 149a; comp. Isa. xiv. 9-10). The Book of Enoch [x. 6, xci. 9, etal] also says that it is chiefly the heathen who are to be cast into the fiery pool on the Day of Judgment (x. 6, xci. 9, et al). "The Lord, the Almighty, will punish them on the Day of Judgment by putting fire and worms into their flesh, so that they cry out with pain unto all eternity" (Judith xvi. 17). The sinners in Gehenna will be filled with pain when God puts back the souls into the dead bodies on the Day of Judgment, according toIsa. xxxiii. 11 (Sanh. 108b).
Link: Jewish Encyclopedia Online
Note, scripture references are highlighted in blue.
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Encyclopedia Judaica:
Gehinnom (Heb. גֵּי בֶן־הִנֹּם, גֵּי בְנֵי הִנֹּם, גֵּיא בֶן־הִנֹּם, גֵּיא הִנֹּם; Gr. Γέεννα; "Valley of Ben-Hinnom, Valley of [the Son (s) of] Hinnom," Gehenna), a valley south of Jerusalem on one of the borders between the territories of Judah and Benjamin, between the Valley of *Rephaim and *En-Rogel (Josh. 15:8; 18:16). It is identified with Wadi er-Rababi.
…..During the time of the Monarchy, Gehinnom, at a place called Topheth, was the site of a cult which involved the burning of children (II Kings 23:10; Jer. 7:31; 32:35 et al.; ). Jeremiah repeatedly condemned this cult and predicted that on its account Topheth and the Valley of the Son of Hinnom would be called the Valley of the "Slaughter" (Jer. 19:5–6).
In Judaism the name Gehinnom is generally used as an appellation of the place of torment reserved for the wicked after death. The New Testament used the Greek form Gehenna in the same sense.
Gehinnom
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Talmud -Tractate Rosh Hashanah Chapter 1.
The school of Hillel says: . . . but as for Minim, [followers of Jesus] informers and disbelievers, who deny the Torah, or Resurrection, or separate themselves from the congregation, or who inspire their fellowmen with dread of them, or who sin and cause others to sin, as did Jeroboam the son of Nebat and his followers, they all descend to Gehenna, and are judged there from generation to generation, as it is said [Isa. lxvi. 24]: "And they shall go forth and look upon the carcases of the men who have transgressed against Me; for their worm shall not die, neither shall their fire be quenched." Even when Gehenna will be destroyed, they will not be consumed, as it is written[Psalms, xlix. 15]: "And their forms wasteth away in the nether world," which the sages comment upon to mean that their forms shall endure even when the grave is no more. Concerning them Hannah says [I Sam. ii. 10]: "The adversaries of the Lord shall be broken to pieces."
Link: Tract Rosh Hashana: Chapter I.
When Jesus taught e.g.,
• “Depart from me, ye cursed, into everlasting fire, prepared for the devil and his angels:” Matthew 25:41
• "these shall go away into eternal punishment, Matthew 25:46"
• "the fire of hell where the fire is not quenched and the worm does not die, Mark 9:43-48"
• "cast into a fiery furnace where there will be wailing and gnashing of teeth,” Matthew 13:42, Matthew 13:50
• “But whoso shall offend one of these little ones which believe in me, it were better for him that a millstone were hanged about his neck, and that he were drowned in the depth of the sea.” Matthew 18:6
• “And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.” Matthew 7:23
• “woe unto that man by whom the Son of man is betrayed! it had been good for that man if he had not been born. ” Matthew 26:24
• “But I say unto you, that it shall be more tolerable in that day for Sodom, than for that city.” Luke 10:12
…..These teachings tacitly reaffirmed and sanctioned a then existing significant Jewish view of eternal hell, outlined above. In Matt. 18:6, 26:24 and Luk 10:12, see above, Jesus teaches that there is a punishment worse than death or nonexistence.
…..A punishment worse than death without mercy is also mentioned in Hebrews 10:28-31.
Heb 10:28 He that despised Moses' law died without mercy under two or three witnesses:
29 Of how much sorer punishment, suppose ye, shall he be thought worthy, who hath trodden under foot the Son of God, and hath counted the blood of the covenant, wherewith he was sanctified, an unholy thing, and hath done despite unto the Spirit of grace?
30 For we know him that hath said, Vengeance belongeth unto me, I will recompense, saith the Lord. And again, The Lord shall judge his people.
31 It is a fearful thing to fall into the hands of the living God.
…..Jesus is quoted as using the word death 17 times in the gospels, if He wanted to say eternal death in Matt 25:46, that is what He would have said but He didn’t, He said “eternal punishment.” The Sadducees did not believe in the resurrection, they knew that everybody died; rich, poor, young, old, good, bad, men, women, children, infants and knew that often it had nothing to do with punishment and was permanent. When Jesus taught “eternal punishment” they would not have understood it as merely death, it would have meant something worse to them.
…..Concerning “punishment” one early church father wrote,
“‘Then these reap no advantage from their punishment, as it seems: moreover, I would say that they are not punished unless they are conscious of the punishment.” Justin Martyr [A.D. 110-165.] Dialogue with Trypho Chapter 4
…..Jesus undoubtedly knew what the Jews, believed about hell. If the Jews were wrong, why didn’t Jesus tell them there was no hell, no eternal punishment etc? Why would Jesus teach “eternal punishment,” etc. to Jews who believed, "The Lord, the Almighty, will punish them on the Day of Judgment by putting fire and worms into their flesh, so that they cry out with pain unto all eternity," which would only encourage and reinforce their beliefs?