Thank you for the references Buz.
The two you shared seem to contrast physical idols (which are not gods) with the Jewish God (who is a real god).
When looking at the origins of Judaism though, the writings depicting the early years don't seem to imply that other gods are not real or not gods.
I noticed Faith's comments on Isaiah, but again I wonder if the description of true God depicts that the Hebrew God is real and the others aren't or that the Hebrew God is true as in faithful to his followers contrasted with the fickleness of some of the heathen gods. Hard to trust a god who changes his mind on a whim.
The Hebrew God is the trustworthy God, whereas the others are not. Not that the Hebrew God is the only real god and the others are fiction, which is what I assume you mean by false gods.
What isaiah is saying does not surprise me since his writings are from the Hebrew God's perspective. Just as the Bible is from the Hebrew perspective.
In our American history it is written how America was discovered. From a Native American perspective I doubt if they would write about when they were discovered. From their perspective it was more of an invasion.
I don't feel that the writings depicting the early years of the Hebrews describes a group who thought the heathen gods were fiction or unreal.
"Peshat is what I say and derash is what you say." --Nehama Leibowitz