I did not mean to set up a strawman. Sorry, I didn't see this post before I made my last one. Does that mean that we agree, then, that there is no immutable core to any religion? And are Christianity and Islam the same in that they both have some "so far unchanging elements"? And that, even there, the application of those elements has changed over time?
Saying there is an "immutable core" is a prediction about the future developments of religion; as there is no real empirical understanding of developments one cannot say whether there is something that never changes.
But i think some so far unchanging elements might also remain unchanging in the future.
E.g. in Christianity that Jesus was crucified and rose from the dead is probably unchanging and i would bet that it never changes into "Jesus was to be burned at the stake, but made himself fire-immune and yet gave his body the appearance of being burned and never died".
The issue in my eyes is whether some unchanging elements are a political problem.
And one such problematic and so far unchanging (or nearly except for some minority movements) elements of Islam is that Quran is verbatim from the perfectly good creator of the universe without any error in this game of chinese whisper (Allah -> Gabriel -> Mohammed -> someone remembering it -> someone who wrote it down -> someone who compiled it).
That has consequences.
For example that at some place, at some time and in some circumstances the perfectly good course of action (what else would a perfectly good creator suggest?) was to
http://corpus.quran.com/translation.jsp?chapter=9&verse=29
"Fight those who do not believe in Allah or in the Last Day and who do not consider unlawful what Allah and His Messenger have made unlawful and who do not adopt the religion of truth from those who were given the Scripture - [fight] until they give the jizyah willingly while they are humbled."
One can quibble a bit with the exact wording; but its about fighting certain people till they pay tribute.
And that makes "abusing" Islam pretty easy; just convince that "some place" is here, "some time" is now and "some circumstances" are fulfilled and one can claim the mantle of perfect goodness for waging a war till the other side is ready to pay tribute.
This and other things in Islam can - at least currently - only be put into hibernation (by successfully arguing its not this place or this time), but cannot be discarded as wrong or at least as wrong for the future.
And such a thing is not that present in other religions.
Closest are Christianity and Judaism with old testament; but Jews were "tamed" mostly by the Romans 2000 years ago (meaning brutally slaughtered for trying to uphold OT teaching that the promised land is theirs) and are simply not numerous enough for serious buisiness; and in Christianity there is a clear chance between the old covenant of OT and the new covenant of NT; so there is some "intelectual leverage" against massacres OT-style (i know, that leverage has not always worked or was used; but there is some change from OT to NT and hence generally disregarding some OT teaching is plausible).
So i think that acting as if Islam is just exactly problematic or unproblematic as any other religion, is ignoring some of the so far unchanging elements of Islam; at least currently in Islam there are greater problems than in many other religions and this is also due to the "theology" of Islam (in combination with other factors).
And one should hence not ignore the "theology" of Islam and its so far unchanging or little changing elements.