In reply to Coel Hellier:
OK - so imagine that a group of Christian fundamentalists bombed an American abortion clinic, killing many, and justified their actions by reference to the old testament - specifically saying their actions were 'Christian'. Then various religious leaders - the pope, and various archbishops, said that these actions were not Christian.
Would you agree that if most Christians regarded their interpretation of scripture as beyond the acceptable scope of their religion, then they were indeed not entitled to the description? The argument wouldn't be about whether the pope and archbishops were 'Christian' but the activists.
That's my point here - that if most Muslims regard IS/Daesh as simply beyond the boundaries of what can be described as Islamic, then they've lost the right to that word. In just the same way that the abortion clinic bombers may well describe themselves as Christian activists, but most Christians would agree that they are not acting in a Christian way at all. And if they tried to call themselves 'Christian whatever' we'd probably start referring to then as 'so-called', wouldn't we?
Regarding the name: my understanding is that yes, Daesh is a literal translation of the Arabic words' initial letters - but that Arabic languages don't use acronyms, so in fact it's just a nonsense word as far as any Arabic speaker is concerned.
Post edited at 12:30