I would like some state-appointed or free, independent Islamic scholar -- Western or not -- to explain with a straight face to me and to the world, the essential, fundamental differences between Islam and "radical Islam" or "extremist" Islam. If Islam is not just a bizarre, "religion," but basically a collectivist ideology bent on total submission of its adherents and of the world, moved by a gnawing appetite for total and universal domination, what are the salient, distinguishing differences? How would one explain the differences, say, between “ordinary” Communism and "radical" Communism, or between “ordinary” Nazism and a benign "moderate" Nazism?
You can’t list those distinguishing differences. They don’t exist. Islam is a one-size-fits-all system, from your footwear to your hairstyle to your diet.
Islam is “radical” because, as both a “religion” and as a political ideology, it prescribes total submission of the individual – indeed, of society – to the arbitrary and wholly irrational rules, permissions, prohibitions, and punishments of its “creed,” otherwise known as Sharia Law. Just as Nazism and Communism required the total submission of the individual to the state, Islam requires the total submersion of the individual to the caliphate. Islam is essentially, and readily admits, totalitarian – root branch, and twig.