Earlier quoted context omitted.
Islam is largely Arabic, but is it the case that things attributed to Arabia are mostly Islamic?
Not at all, the Koran is written in the context of Arabia at the time. This is not a matter of interpretation, the book itself references local customs and laws. Therefore, our understanding, the practice and everything else in Islam is crucially shaped by the society in Arabia, and the change it brought to it. I think it is best read and understood in terms of the Delta - the change - it meant to convey (but that is…
As an ex-Muslim, the way I see it is: If you were to rely primarily/only on the Koran, it is because you want to justify and legitimate your own agenda. The Koran is very flexible and can be either very progressive or very conservative, strict and violent.
So you make your pick and then find the particular "bayt" that supports your claims :)