Jinn gave rise to genies as you say, and I suspect they had various meanings and stories amongst the tribes before they appeared in the Koran. From memory, I think only one Jinn is in the Koran – Iblis – and he appears a couple of times. Chapter 18:50 recalls the earlier event where Iblis refuses Allah’s request to bow down before Adam along with the angels. In some English translations, Iblis is said to be Satan, but in others he is just a grumpy and contrary character who I have presumed to be the metaphor for disbelievers (especially as the Cave sequence has clear links to the Sleepers of Ephesus stories – but has much wider meaning, I think; and the Ephesus story may stem from the cave of the five kings legend – Joshua 10:16-27, in which the description of the cave could also be the forerunner to JC’s tomb). The Koran in both places makes a point of noting that Iblis disobeyed Allah’s direct command, yet this affront is tolerated without comment, suggesting that there is another metaphor here (or certainly another layer of embedded meaning – as happens a lot in the Koran). Did you ever study this book in depth?