What if the bible were rewritten?

[abaris]

The earliest concept of Hell we know about is part of Zorastrianism, so Zoroasters probably the one you want.

But don't forget that the english as well as the German words for it have their origin in the germanic goddess Hel and her hangout. There are quite many examples of an underworld although it wasn't so much described as a place of torture, but rather of Oblivion. The Egyptian mythology also had the concept of final judgment with Osiris presiding. If you failed the heart test, you were swallowed by a beast, although as far as I know, this simply meant non existence and not eternal torture.