There's a difference between those generalises which legitimately simplify, and those which actively obscure, and you are frequently risk falling into the latter.
Please point where exactly I do, it's hard to discuss at this level of generalisation - about islam, or about my own words.
Those are all very poor examples- in each case, you have reduced each faith past it's essential tenants, and then reclaimed them when appropriate "Islam may include Baha'ism, but Baha'ism is not Islam"- thus allowing you to assert a very bizarre taxonomy. Every one of those religions, while sharing basic Abrahamic tenets, has certain qualities which are common to every sub-section of that faith, but exclusive to that faith, and which represent the essential nature of that faith. Both Christians and Muslims recognise Jesus as sent by God, yes, but the former recognise him as the final prophet, as the Messiah, and as god himself, while the latter recognise him only as the penultimate prophet, and recognise Muhammad as an additional, final prophet. Thus the essential nature of both Christianity and Islam are arrived at.
Not all christians consider Jesus to be the final prophet (for example mormons apparently don't, additionally the New Testament mentions there'll be prophets after Jesus. May I add: prophets, in plural, so that no-one would think it's about Muhammad. I believe that arabic language is more specific in this regard, as it distinguishes between rasul and nabi, one would have to check arabic bible), nor God. It is possible that all christians consider Jesus to be Messiah, but so do muslims:
So you're wrong if you think that this is what distinguishes them. Also, the definition of "La ilaha illa Allah wa Muhammad rasuluhu" is empty if one doesn't know what were Muhammad's teachings, just as definition of christianity as the religion based around Jesus is empty if one doesn't know his teachings.
recognises Muhammad as the final prophet of God and the Koran as the word of God as transcribed by Muhammad, so we can start from there.
There were and are islamic groups that claim there were prophets who came after Muhammad. There are also islamic groups that claim that the real messanger from God was in fact Ali, not Muhammad, or even that Ali was God, or some other shiite imam was God etc. There are islamic groups that do not obey the most basic religious duties prescribed by Coran.
Why assume that the small sects are irrelevant? If they can be demonstrated to occupy a legitimately consist position, then they contribute to the analysis of the religion's essential form. The vast majority of Christians believe in the trinity, after all, but those few "small sects" that do not make it clear that the trinity is not an essential part of Christianity.
Yet it'd be strange to describe christianity without any mention of the trinity, or to describe islam without mentioning a pilgrimage to Mecca.
If I find them irrelevant it's mostly because they are relatively small, very heterodoxical and may be considered separate religions.
You are free to discuss trends tendencies within Islam, but these must be recognised as such, and not treated as a unanimous interpretation of the religion.
I encourage you to find some post of mine referring to something as (apart from belief in existance of God and that Muhammad is a prophet) unanimous in islam, or any post of mine that claims that all muslims are so and so, or do that or that.
You can, but you must be careful about the manner in which you do so. The Koran is an inanimate body of text, and Sharia a highly disputed set of abstract concepts, so you can only deal with interpretations as they exist, rather than simply issuing your own- that is simply a pantomiming of Islam, not a critical examination of it's contemporary practice.
Please, don't be offended, but describing sharia as "a highly disputed set of abstract concepts" is completely erroneous. It is, in fact, opposite: a set of very down-to-earth and detailed regulations concerning all aspects of life. I wouldn't call it "highly disputed" either. You seem to be gravely mistaken on the subject what sharia is. Sharia doesn't need interpretation. It IS a set of interpretations of the holy text and sunna.
I may remind you that I didn't post interpretation of the hadiths and coranic verses of my own. I quoted them.
And if I claimed anything about muslim duties etc - I repeated what muslim jurists said. I do not usually read the jurists's work, but recently I've been forced to brief through some parts of Kitab al-Umm of Ibn ash-shafi'i as well as through one another book which's title I forgot, but may look it up if you want me to. I recalled one specific part, where the jurist answered a question if muslims can burn orchards and palm-trees of enemy at war (I don't recall if it was about houses as well), and he claims that yes they can, because Muhammad when he was at war with some tribe burned some of their palms. That's how shari'a works, it is about very specific, practical laws. And this example in fact shows a problem: not only was such act considered bad in gahiliyya times, I believe (that's why I was surprised by it and remember it), but it'd fall under cathegory of war crimes today. I believe that definite most of muslims would not accept such behaviour as anything good, and most of them most likely don't know the story about Muhammad and this tribe, nor Ibn ash-Shafi'is or whoever's opinions in this matter. It's of no importance for the essence of islam. But I guess that if they did know the story and the legal opinion in such matters, that may - and from a religious point of view should - influence their opinion to say that such behaviour is acceptable.
I meant that moderate, Westernised Muslims are not compromising their faith, but stripping away non-essential layers of religious (and often purely cultural) padding until they find that basic Western values (or their interpretation of them) and Islam (or their interpretation of it) are compatible. That does not suggest that Islam was ever incompatible, merely that the particular form they adhered to was incompatible (if it indeed was; the talk of "reconciling their faith" often relies on the questionable presupposition that "native" Islam is necessarily incompatible with Western democratic values).
You claim that Islam (or their interpretation of it) is compatible with basic western values if they strip away the non-essential layers of religious padding. What constitutes the "non-essential layers" and what constitutes the essential core? And why do you believe that this core shall be compatible with basic western values? Shall one peel one "layer" of islam after another until there's nothing incompatible? That'd simply mean that the core is what's compatible with western values, that it's western values which decide what's important in islam, and what's not.