I have a question on the concept of hell. Is hell an Athenian dualistic influence on Christianity? It is clear that the Judeo-Christian concept of hell did not predate Christianity? Was this injected as a need to placate Athenian dualism?
Zoroastrianism, and their idea of dualism, did have an influence on how hell would later develop, partially because it was the influence of Zoroastrianism that helped in the formation of Satan, as he is now seen. Athenian dualism may have helped influence the concept of hell; however, the big influence here would be Zoroastrianism.
The history of hell is somewhat complicated. Before Christianity, there were Jewish sects that began having an idea of what we could call proto-hell. At the same time, in the history of Judaism, some didn't believe in an afterlife at all.
Coming more towards the first century, we do begin seeing some ideas of proto-hell and Satan really taking form. There were those who believed the evil would burn in Gehenna or at least was the destination for the wicked.
So there was some foundation that the Christians later built on, but they did really change the concept of hell over the years. Even today, the concept is still changing. A popular concept is that hell is just a distance from God. The fire and brimstone have been removed, at least for some denominations. I would wager that this concept will eventually replace the older concept of fire and brimstone.