Brian Stiller (a Canadian) has been Global Ambassador for the World Evangelical Alliance (WEA) for the past four years. In this capacity he has visited dozens of countries (including Somalia, Japan, Nepal, Iraq, Egypt, South Sudan) to witness and liaise with Christian groups, especially those suffering persecution.
He has recently edited, along with other scholars, a volume entitled Evangelicals Around the World: A Global Handbook for the 21st Century (Thomas Nelson, 2015).
Along the way Stiller has gained a deep knowledge of the nature and problem of extremist Islam.
His four-part analysis of ISIS is the best and clearest I have found, and should be helpful to anyone wanting to understand the roots, development, character, and goals of this movement. It is particularly helpful in being informative yet non-ideological, while acknowledging the genuine danger of this form of extremist religion.
Stiller’s analysis originated as four “Dispatches from the Global Village” sent as emails to interested persons, which are now compiled into one succinct, yet comprehensive, article. The four parts are:
ISIS Part I: What it is
ISIS PART II: Four central questions
ISIS PART III: Six underlying realities; seven stages in conquest
ISIS PART IV: A Christian response
This is well-worth reading by anyone who wants to be informed on the subject.