You would have thought that something so basic would have clicked for 21st Century Muslims but it has made them more desperate to make the Quran greater than it is.
I've been watching videos of them debating at Speakers Corner. Fascinating viewing.
https://youtu.be/3mWp8GgxN78
Those different sects are basically different cultures where Islam hasn't completely taken over. Sufi’s like their music and whirling dervishes dancing but that was their culture before Islam. They are not considered Muslims by different Muslims.
A sufi musician was killed not long ago...