Not the only factor, but the Saudis have funneled a great deal of oil money into spreading Wahhabism.<p><a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;International_propagation_of_conservative_Sunni_Islam#.22Petro-dollars.22" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;International_propagation_of_c...</a>