How islamic has the “islamic state” been?

Two principal views have emerged on the nature and operations of the so-called Islamic State or khilafat. One contends that IS had nothing to do with Islam in both its ideological disposition and practical operations. The other view claims that IS was the embodiment of a Salafist-Wahhabi version of Islam, and therefore it was Islamic. Whereas the first view recognizes the fact that Islam like any divine faith is open to a range of interpretations and applications, the second perspective has treated Islam as a monolithically adaptable doctrine, ignoring the diversity within the Muslim world.