&gt; That Islam allows a way for them to recruit does not mean they are Islamic only opportunistic.<p>Very true. Incidentally (and ironically), Islamically one is not allowed to overthrow their (Muslim) government to &quot;establish a caliphate&quot;. So what ISIS is doing is against the teachings of Islam to start with. They take texts, keep what they like and leave out what they don&#x27;t like, and use those texts for their own purpose.<p>We have in Islamic literature, several authentic narrations that talk about, and warn of people who have a similar ideology to that of ISIS.