What an incredibly sad state of "Research," we have to tolerate out here.
Here is a plethera of scholarly article, papers, and books tracing the roots back over 500 years before Christ! Thanks for you merriam reference dude.
Now lets here from some scholars:
"Within Second Temple Judaism, Sheol is transformed into a place of differentiation: the souls of the righteous depart to a place of blessing, the wicked to a place of torment. For the New Testament writers, this concept remains, but the soul is now conjoined to the physical body, and in the later post-apostolic period there is accentuated terror for the wicked in vivid descriptions of the eternal fires of hell."
So while no one is denying that the view of hell developed through the middle ages and beyond, it clearly didn't originate in the 5th century C.E. as your "research," suggests.
Second Temple period starts ~516B.C.E. and ends 70 C.E.
http://eprints.whiterose.ac.uk/95914/1/BR2_Finney.pdf
Avery-Peck, Alan J., and Jacob Neusner, eds.
Death, Life-after-Death, Resurrection, and the World-to-Come in the Judaisms of Antiquity. Leiden, The Netherlands: Brill, 1995.
Collection of essays that discuss the topic of “hell” as part of a broader discussion about death and the afterlife within ancient Judaism. Includes essays on the concept of the afterlife in the Psalms, Wisdom literature, Apocalyptic literature, the Dead Sea Scrolls, the Gospels, and rabbinic literature.
Bernstein, Alan E.
The Formation of Hell: Death and Retribution in the Ancient and Early Christian Worlds. Ithaca, NY: Cornell University Press, 1993.
An overview of hell that focuses on the development of the idea in Greek, Roman, Jewish, and early Christian milieux, concluding with the views of Augustine. Since Bernstein is concerned with a relatively shorter period of time, his treatment of the theme within the biblical texts is more expansive than some of the other overviews. (Ends with 5th Century, not begins )
Nicklas, Tobias, Joseph Verheyden, Erik Eynikel, and Florentino Garcia Martinez.
Other Worlds and Their Relation to This World: Early Jewish and Ancient Christian Traditions. Boston and Leiden, The Netherlands: Brill, 2010.
DOI:
10.1163/ej.9789004186262.i-402E-mail Citation »
A collection of essays that includes treatment of the concept of “hell” as part of topical essays on “other worlds” within the Jewish and Christian literature of Antiquity. This volume includes essays on “other worlds” in the Enochic literature, the Dead Sea Scrolls, rabbinic literature, Virgil, the New Testament, and the early Christian apocalypses.
Segal, Alan F.
Life after Death: A History of the Afterlife in the Religions of the West. New York: Doubleday, 2004.
An overview of the concept of the afterlife as it pertains to Western religious traditions. Includes significant chapters on the concept of afterlife in First Temple Israel, Second Temple Israel, Paul, the Gospels, the Early Church Fathers, and the Rabbis. Segal’s introduction to the topic includes basic historical background for each of the texts he discusses.
Vorgrimler, Herbert.
Geschichte der Hölle. Munich: W. Fink, 1993.
A very broad overview of the concept of hell, beginning with Sumerian ideas and continuing chronologically to the present day. Working from the tradition of systematic theology, Vorgrimler is primarily concerned with hell as a theological concept.
While your resource Jon Sweeney, has an undergrad from Wheaton in philosophy and medieval
studies. He is a book writer for the last 20 years, not a scholar not even a Master's thesis. Zilch...
By the way your researcher dropped out of 2 mDiv programs before dropping out of Evangelical Christianity. Point is not ad hominem attack, point is He is not a scholar by any stretch of the imagination. And his so-called scholarship is not even about the origin of Hell but the origin of Dante's version.
Way to go with the internet standard for experts.