From what I have read, the main views are these.
- Etiological; to establish the origin of certain crafts.
- Theological; to commence a narrative of “two seeds”, the “sons of God” (the faithful), and the “sons of men” (the unfaithful).
Scholars commenting on the conflict with the global flood interpretation of the narrative often make comments along the lines of “The composer of this narrative didn’t notice or didn’t care about the contradictions”, or “The composer of this narrative wrote at a time when the other narrative sections were not yet extant, so there were no contradictions; tension between the two narratives was caused by a later redactor conflating them”. Have you seen Carol Hill’s work on the characters in this chapter?
While we’re here, let’s talk about Genesis 5. Modern commentary draws parallels with Sumerian chrono-genealogies. Sumerian texts have similar records (the Sumerian King List, and the Rulers of Lagash), with even longer ages; kings ruling for tens of thousands of years. However, the context in which these ages are found, it is clear they were not intended to be taken literally.
En-me-barage-si is said to have ruled for 900 years. His historicity is established by epigraphical evidence, so we know he was a real figure. This also means that scribes recording the lives of the kings, were contemporary with En-me-barage-si and knew that he did not literally rule 900 years. There is no epigraphical evidence that people in his day believed he had ruled for centuries; the earliest attribution of a 900 year reign dates to around 600 years after his kingship.
As a side note, you can see that historians accept the historicity of En-me-barage-si even though he is said to have ruled for 900 years. Likewise, Gilgamesh is considered a historical figure despite having supposedly reigned for 125 years.
There are other patterns in the Sumerian King List which indicate the numbers are symbolic. In the earliest stage of the king list, rulers reign for up to 43,000 years. Then “the flood swept over”, and the next section of the king list describes kings with reigns which are drastically shorter; still centuries long (even over 1,000 years), but on average less than one tenth the length of previous reigns. In a later section, the reigns become much shorter still; down to less than 500 years.
Later again, the reigns drop massively, down to less than 100 years, and typically less than 30. Each reduction in the pattern of reign lengths, is preceded by a change of kingship from one city state to another. So when the city state of Eridug rules, the reigns are tens of thousands of years, when the city state of Kish rules the reigns are rarely over 1,000 years, when the city state of Ur rules the reigns are less than 100 years.
The length of rulership is associated with a gradual declining glory of the empire, and indicative of the strength of the prevailing city state. Interestingly, when the when the city state of Kish ruled for the first time the reigns are centuries long though rarely over 1,000 years, but when the city state of Kish ruled for the second time, the reigns are much shorter, less than 500 years. This indicates that the second time Kish ruled, the city state had declined greatly in power and glory.
Another indication that the reigns were not taken literally, is the way in which they are treated by other Sumerian texts. For example, a list extremely similar to the Sumerian King List, was produced by the city state of Lagash. This list, called the Rulers of Lagash, was actually written not as a sober historical document, but was written specifically as a parody of the Sumerian King List, an expression of the feud which Lagash had with the other city states.
The Rulers of Lagash is intended to ridicule the Sumerian King List. But a superficial reading of the text does not reveal this. Here’s an excerpt from the Rulers of Lagash.
164-172En-entar-zid: his god was Mes-an-du (?), of the seed of ancient days, who had grown together with the city, he acted for 990 years. …, the son of En-entar-zid: he dug the canal Urmah-banda, and the canal Tabta-kug-jal, his personal god was Mes-an-du (?); his master Nin-jirsu commanded him to build his temple; he acted for 960 years.
173-175En-Enlile-su: he acted for 600 years. …, the son of En-Enlile-su: his personal god was Ninazu; he acted for 660 years.
176…: he acted for 1110 years.
177-181Puzur-Ninlil: he acted for X x 60 + 1 years. En-Mes-an-du (?), the son of Puzur-Ninlil: his personal god was …, he acted for 120 years. Dadu, the son of En-Mes-an-du (?): he acted for 160 years. Tuggur, the son of Dadu: he acted for 160 years.
182…: he acted for 120 years.
183-191Puzur-Mama, the scribe of Ninki: his personal god was Zazaru; he acted for … years. Lamku-nijgena (?), the administrator of Puzur-Mama, who built the wall of Jirsu, his …, and the Tirac palace in Lagac: he acted for 280 years. Henjal, the son of Lamku-nijgena (?): his god was Pabilsaj (?), he acted for 140 years. …, the son of Henjal: he acted for 144 years.
192-199Ur-Ninmarki, the scribe and scholar: …, his personal gods were Haya and Nisaba, he acted for X + 20 years. Ur-Ninjirsu, the son of Ur-Ninmarki: he acted for X x 60 years. Ur-Bau, the scribe of Ur-Ninjirsu, who … in the assembly: he acted for X + 30 years. Gudea, the younger brother of Ur-Bau, …, who was not the son of his mother nor the son of his father: he acted for … years.
200Written in the school. Nisaba be praised!
Genealogies and rulership records could have social, historical, political, theological, and even cosmological significance. They were very important documents. In the case of the Rulers of Lagash record, the parody is identified by comparing the list with the original Sumerian King List. Similarly, it has been proposed that the chrono-genealogies of Genesis 5 are a parody of the Sumerian King List.