Did anyone notice how the New World Translation in Deut. 32:8 translates it "sons of Adam" rather than "sons of God"? Yet the angels are described in the NWT as sons of the (true) God in Job 1:6; 2:1; 38:77 It seems to me that angels were considered gods by the nation of Israel, yet subordinate to Yahweh at this time period (Deut. 4:19). Yet, Ps. 82:7 is apparently a turning point, where they are stripped of their divine status. Is this when Israel becomes monotheistic?
Also, their are examples of people like Micah who made a carved image of God, which was taken over by the Danites (see Judges 17:1-5 and 18:20-24, 30-31) in spite of the Mosaic Law's prohibition in Ex.20:4-5 So, yes, there are definitely traces of idolatry as well. What, therefore, do you think caused a turnaround, where the people no longer make idols, no longer worship angels?
One more question. In the numerous passages that speak of the God of gods, does this mean that the people believed in other gods but worshipped only one? Would that make them henotheistic rather than monotheistic?