Hey Avi
I am actually quite encouraged to hear this and would like to learn more about it. I have been participating in “real live” interfaith dialogue for the last few months and was not aware of the “adaptationist” approach in Islam. Also, are you using "adaptationist" and “assimilationist” in a positive, negative or neutral connotation?
The philosophic shifts in Islamic thought began when Muslims were introduced to the Greek philosophy, especially Aristotle. You might have heard names like Averos and Avicenna, these guys came during this period. They were followed by the Mutazillite movement, which did not last long and was finally put to rest by al-Ghazali and the foundation of Occasionalism, which in turn influenced European philosophy, before Europe rejected its principles (tried to refute it but failed, as far as I am concerned). I am still an Occasionalist today.
As for the question about the terms, I am using the terms in a neutral sense, but still the issue gets complicated. These labels can seem relative (even though they are not) for example: I may consider myself an orthodox Muslim. But someone else who also thinks he is orthodox, can hold views which are very different then mine. For example, I believe in evolution through natural selection, most "orthodox" Muslim, however; believe in intelligent design or creationism. But all I am doing is reading and analyzing the words of the Quran which does not contradict natural selection. And neither does natural selection contradict the Quran, since it only provides a mechanical description of pattern formation. See how it gets
complicated yea?
Also, by the way, I would like to emphasize the point Netti makes above that there isn't really a connection between the theology of a religion and the religious
institutions which are in power. This is really important. The start of
all the Abrahamic religions began as a rejection of the same types of institutions which hold these labels today. Refer to Max Weber and his work on the evolution of religion. All the Abrahamic religions began as revolutionary movements by Prophets who rejected the rigid, scholastic and man-made intellectual institututional establishments... but then eventually
the followers of those Prophets always end up creating new institutions and become the personification of everything the Prophets came to warn against.