Wahhabism from Saudi Arabia is the mediaeval version of Islam followed by extremists such as ISIS. There are more benign versions already out there.
Saudi is a notoriously unequal society, and when life on this Earth is so unutterably miserable, it is easy to see how they can recruit jihadists on the promise of a better afterlife.
Hopefully when information is more freely available to everyone, then indoctrination of iliterate people becomes more difficult and these backwards beliefs will die out.