"A former imam of the Grand Mosque in Mecca, Sheikh Adil al-Kalbani declared with regret in a television interview in January that the Islamic State leaders “draw their ideas from what is written in our own books, our own principles.” [...] There is a broad consensus that the Saudi ideological juggernaut has disrupted local Islamic traditions in dozens of countries — the result of lavish spending on religious outreach for half a century, estimated in the tens of billions of dollars."