Diogenesister,
El and his cohort of gods - the Elohim - came to the Israelites from the north. The Israelites took a few of 70 or so gods on offer. Initially EL was also made their chief god while Asherah was his wife and Baal was one of their sons. Yahweh came from the south, in the region of Moses' father-in-law. Yahweh was not part of the Elohim
There were similarities with Ba'al and Yahweh: both were angry, warrior weather-gods, but they were not the same god.
Yahweh became the Israelite's main god, and in time characteristics of other gods and goddesses were applied to him. El was an old god with a beard - the original "Ancient of Days". In time Yahweh became identified with El. The writers criticised Ba'al but never El.
Monolatry means to worship one god but to recognise that there are other real gods, but they are lesser gods. Henotheism says that not only are there other gods but there is recognition that other people may worship their god with equal validity.
I am aware of Finkelstein. I suggest reading a range of scholars to see a wider range of views.
I do not know why the NRSV rendering is different. It might relate to their source. Maybe someone can help here. Look at the marginal readings. My NIV writes: "Jeshurun" in the margin. Conduct a wide ranging online search for the full background of that word.
Regarding "satan", note that the Biblical concept is very different to that which was developed during the European Middle Ages. In Job, Satan had direct access to God in his court. Satan was simply an accuser.
Doug