Firstly, the text was in a constant state of flux for a long period, with scribes thinking it was their responsibility to amend the text to suit their current understanding. (The WTS "text adjusters" are rank amateurs.) There is no way known that anyone knows what was originally written, whether it be in Aramaic, ancient Hebrew, Greek or whatever. Today there are arguments over the various Hebrew Scripture texts (Symmachus, various LXX, Theodotian, etc.) When the Masoretes decided on their Hebrew text they simply set a corrupted text in concrete (Emanuel Tov). Likewise with the Greek Scriptures, disagreements run over Erasmus' Textus Receptus, Westcott-Hort, Nestle/Aland, etc., or a mixture (eclectic).
Secondly, many/most of the concepts taken up by the very early Christians came from the material produced during the Second Temple Period,not from the Hebrew Scriptures. Typical of these include "Azazel/Beliar/Mastema/Devil =>Satan", also the idea of a "war inside heaven", and so on. We are speaking of Enoch, Jubilees, etc. The Book of Daniel was a late product of this heightened eschatology/demonology, even including The Watchers.
Deuteronomy was the product of the Josianic period and was greatly influenced during the neo-Babylonian period.