At every opportunity our cretinous leaders spout the total rubbish that the Islamic State's barbarism is nothing to do with Islam. The likes of Cameron, Obama and Kerry along with a gaggle of lesser twits must think we are all stupid; either that or they are too scared to speak the truth.
Here is the Qur'an verse 47:4. It looks quite understandable to me but not those idiots we have in charge.
So when you meet those who disbelieve [in battle], strike [their] necks until, when you have inflicted slaughter upon them, then secure their bonds, and either [confer] favor afterwards or ransom [them] until the war lays down its burdens. That [is the command]. And if Allah had willed, He could have taken vengeance upon them [Himself], but [He ordered armed struggle] to test some of you by means of others. And those who are killed in the cause of Allah - never will He waste their deeds.