Your Wikipedia "knowledge" is showing. Yes, through the ages there were different theologies, but they have all been eliminated down to a handful of very private worshipers who would not dare go against the teachings of the Islamic states. Now there are different schools all with the same theology in every way that matters. Even the difference between Shia and Sunni is only meaningful in terms of certain practices and political successions, all of which doesn't concern a non Islamic neighbor who has to share a bloody border with them.
Apologize for them all you want, the problem in Islam IS the Koran and the Hadith, and what they teach. Nothing else but the words as written in "unalterable" form, which is why there has never been and never will be an Islamic reformation or reassessment of the surahs. Islam was created to dominate and control the earth, and that is exactly what it has tried to do for a thousand three hundred years.
Your opinion just like a Unitarian Universalist who takes the happy, merciful words of the Bible and just ignores the rest, which can be uncomfortable for even a Christian of strong faith. Any religion can only be considered in regards to it's most orthodox and fanatic elements. The rest is human social systems and politics laid ontop of it, but Islam is kind of an exception, because it isn't JUST a religion. It's also a political system, system of juris prudence that does not accept any difference between man's law and Allah's law.
Islamic countries are never multicultural, because Islam does not allow it. Once they are anything but a tiny minority they attack. They simply cannot "Coexist" when God commands they convert by the sword. Only on an island like Indonesia so they seem to no have territorial and slave designs on their neighbors who aren't Muslims.
I wonder how many Islamic countries you've been to, and how emersed in the culture you became to be such as expert? All of this did not and does not preclude me from having quite a few Muslim friends, who are good guys, but IMO they are all "bad" Muslims to a man.