Several patterns immediately strike the eyes.
(1) As can be expected from Lebanese consanguinity data, the Christians and Alawite areas have lower rates of cousin marriage, while Sunni areas have higher rates of cousin marriage.
(2) It also maps very well onto maps of political control by Assad, Al Nusra/FSA, and ISIS, down to the detail that even in contested areas the regime tends to control the cities – Aleppo, Hama, Homs, Damascus – while insurgents have a major presence in the surrounding countryside.
Is there an ethno-religious confound in play (i.e. Shi’ites support Assad, and Sunnis support Islamist rebels, regardless of consanguinity levels)? To a large extent, that is surely the case. But note that Al Raqqa city and its countryside, the two regions with the highest %consang rates out of all surveyed Syrian cities and rural areas, just happen to be the heartland of Islamic State power. Across the Muslim world, there is definitely a good correlation between rates of consanguineous marriage, depressed IQs, and support for radical Islamic positions on issues like apostasy. Surely it is not entirely a coincidence that the two single areas in Syria with the highest rates of consanguineous marriage also happen to host the most “virile”/virulent strains of Islamic extremism.
(3) There is an R2=0.38 correlation (excluding the one strong outlier that Idlib) between rates of consanguinity and support for Assad in the Syrian governorates. Considering the small samples, the clumsy averaging, and the uncertainties of surveying both cousin marriage rates and political attitudes in a civil war environment, this is not an unimpressive result.