Significant negro admixture in the majority of MENA causing changes in behaviour is unlikely, this is just an HBD "just so" story, if MENAs act a certain way its due to the negroes. I have seen people claim that Iran's IQ is only barely above that of American blacks because of black admixture when it's more likely that Richard Lynn simply is wrong about Iranian IQ like he is about east asian or south/east European IQ.

"The fall of Islam would also deprive the Arabs of their single biggest mobilization factor: Islam. Without it, they have no reason to wage fanatical wars or terrorist operations. They'd just sit in their homes and smoke hookah."

Islam was not able to assert itself civilizationally/militarily against the west after the prime of the Ottoman empire, instead taking advantage of the West's good will/weakness through immigration, sporadic spectacle terrorism and appeals to anti-bigotry and the like in the modern day, I wouldn't fear an offensive military jihadist operation from an Islamic power like the Islamic conquests of old, let alone from Arabs as it is not feasible any time soon.

I do think that a decrease in the influence of Islam in MENA would have an overall salutary effect on MENA behaviour and decrease the power of Islam which is seen by many as a rallying point for the juvenile militancy of coloreds and the "oppressed" around the world (think Islam in black American communities).