We all want there to be some form of Cosmic Justice, and our desire for it does indeed point to Christianity. So does our desire for reconciliation and need to be forgiven. I, for one, am glad that there is not only Justice but also Mercy.
Well... In fairness, branches of Christianity that believe in eternal punishment as a routine destination for the wicked are actually a minority among world religions.
Talmudic Judaism is rather vague about the afterlife in general, and the destination of the wicked in particular.
Gehinnom is variously interpreted as a place of torment similar to the Hell depicted in
Dante's Inferno, or as a place of reflection and repentance similar to the Roman Catholic concept of Purgatory. Either way, it's just a waypoint where even the souls of merely average people spend a period of not more than 12 months after their departure from this life before they proceed to
Olam Ha-Ba (the World to Come), and in most branches, eventual resurrection. Only the souls of the extraordinarily wicked don't make that final leg of the journey, with their fates variously taught as being eternal torment, eternal remorse, or annihilation.
Kabbalistic branches of Judaism (and a few branches of Christianity that integrate Kabbalistic or other mystical beliefs) have a much more highly-developed set of beliefs about the afterlife. They tend to view resurrection as an ongoing, repeating process of reincarnation that is a central part of
tikkun olam, the mending of the world. Some branches believe that all souls are routinely reincarnated until they're sufficiently purified. Others believe that only those souls who remain unremorseful after their 12-month stint in
Gehinnom or those who have other unfinished business on earth (which may or may not have anything to do with bad behavior on their parts) will be reincarnated.
Most Eastern religions also believe in reincarnation, with or without the possibility of some exceptionally incorrigible souls being annihilated either individually upon physical death or collectively at some future time (for example, at the arrival of
Kalki, the "Destroyer of Filth," as interpreted by some Hindus). Until then, the process continues, with reincarnation as a lower caste being a possibility in some Eastern religions (for example, the ongoing process of
samsara in Hinduism). Most Eastern religions also believe in an intermediary stage of reflection and instruction between lives (for example,
Gandharva or
Bardo in Buddhism). Few (if any) Eastern religions believe in eternal punishment. At worst, some traditions provide for the annihilation of the souls of the hopelessly wicked, not their eternal torment.
Some Christian denominations also reject the notion of eternal punishment. The Church of England, some smaller Anglican branches, the Jehovah's Witnesses, most of the Adventist denominations, and most of these denominations' collective offshoots, for example, specifically believe in the annihilation of the wicked, not their eternal punishment. Annihilationism is also a minority belief in some other denominations: not officially accepted, but allowed for as a possibility.
We also have the various Universalist denominations who believe that all souls will eventually be reconciled with God, usually through some variation of the doctrine of universal salvation of the entire human race through Christ's substitutionary death, but in some branches through a process similar to that of the Roman Catholic doctrine of Purgatory.
Speaking of which, Roman Catholic theology is actually more universalist than most people realize. Roman Catholic theology believes that Christ's death is sufficient for the salvation of almost the entire world. Hell is reserved for the exceptionally wicked and for those who have specifically and explicitly rejected salvation. Most everyone else's souls will go to Purgatory, not hell.
Purgatory is not a place,
per se', nor is it necessarily punitive other than in the sense of causing a soul to feel the pain of remorse. Rather, it's a state of reflection, repentance, and cleansing in which most people will need to spend some time to become sufficiently purified to go to heaven. Neither does Purgatory have to be an intermediary stage between Earth and Heaven. All or part of one's time in Purgatory may be served on this earth. People suffering from serious illnesses, persecution, oppression, poverty, and other afflictions, for example, may be doing Purgatory on Earth, especially if they learn things like compassion and forgiveness through their sufferings.
In short, the concept of Hell being the automatic and eternal destination of all but the saved or the extraordinarily righteous is the dominant belief in Christianity, but it is a minority belief among the world's religions as a whole.
Rich