It depends on what IS is...

Here's a good article Andrew Bostom posted a few weeks ago, that helps illuminate some of the complexity of the Iraq catastrophe, and shows that Islam is the main problem, not merely ISIS/ISIL/IS.

Also see this helpful collection of links linking ISIS with Islam.

Numerous other reports and analyses exist out there, on the Internet, just a few mouseclicks away; such as, for example, these David Wood videos detailing how ISIS is following the Koran "to the letter".