I think you're incorrect about Virgil and Aristotle. Virgil certainly did write about an afterworld in the Aenid and it is referenced several times in the footnotes of the edition of The Inferno that I'm reading. Aristotle may not have come up with a Hell per se, but the Greeks had a concept of Hades and the underworld hundreds of years before Christianity was even an idea. Aristotle's images are also referenced in the book.
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