You're repeating "higher critical" nonsense.
Thought you might have some insight into this.
I disagree.
Abraham, the first Jew, was not a henotheist.
The Biblical account of Abraham describes a man who (1) entirely rejects the religious tradition of his nation (the Chaldaeans of Ur) and (2) worships a single deity who claims power over the entire earth and over all peoples.
The putative henotheist of 1800 BC was a man who believed in the same deity that his family had traditionally believed in and viewed that deity as being a deity whose authority was limited to his own people and whose authority was limited to one geographic area or area of expertise (say fish for a people consisting of fishermen, etc.)
Abraham made a radical break from that milieu. And, unlike henotheists, he refused to follow the ways of other deities or worship other deities when visiting or dwelling among the henotheists of the ancient Near East.
A better way to look at it would be to say that the deity of Biblical Judaism was henogenic - there were many people besides the descendants of Abraham, but God chose that specific people as his own.
Sort of the inverse of henotheism - the Bible portrays one God choosing one of many peoples, not a people choosing one of many gods.