OThank you Phizzy. This is fascinating.
Christianity is derived from an apocalyptic sect of Judaism. If I understand Doug correctly - and Phizzys post - dualism was a product of the Exile. Did the concept of a Messiah even exist pre-Exile, other than in the sense of anointing a king? The belief in a saviour and in an end-time showdown between good and evil seems alien to the OT before the influence of Zoroastrianism.
Sorry Doug I have been slow on the uptake.
ETA - I hope I haven't broken forum guidelines by failing to mention Trump I'm this post.