Of course, and that's my point. That culture isn't defined solely, or even primarily by genetics. Not even close. Religion is a social system. Islam is a totalitarian system that effects all aspects of society. Hell, it's basically Muhammad's whole point: to unite all of the bickering arab tribes, clans, and ethnic groups into a single homogenous culture. It worked for nearly a thousand years. Though there was still infighting, and multiple civil wars, most of these came about as the result of the innate authoritarianism of Islam. It's clear that the culture of Islam is the specific issue, not the genetic make-up of people there (excluding inbreeding, and even then, that's not as detrimental to society as Islam's practices).

I'm an Atheist & an American Liberal (as in American Revolutionary Liberalism).

If Arab Christian moves next door to me, I have nothing to worry about.

If an Arab Entrepreneur moves next door to me, I have little to worry about.

If an Arab Communist moves next door to me, I'm going to be a bit nervous, and build a fence to protect my property.

If an Arab Islamist moves next door to me, I need to buy a gun to protect myself, and build a fence.

A racialist or an ethno-centrist just saw the same person repeated 4 times and will not treat them differently. That's intentionally disregarding nuance and individuality in order to support their narrative.