Islam through the centuries has drifted away from its fundamentals.
Along come Muslims like Wahhab in the 1700s and Sayeed Qtub in the 1900s who try to get the heretics apostates and infidel collaborators back to what Allah and Muhammad want done- subjugating converting or killing us Kafirs.
ISIS is the most recent example, of getting Islam back to basics. - -Tom
The Saudi royals fund and push Wahhabi ism for a reason ...