I think you are not far off. Just found this:
Muslim Inbreeding May Be Genetic Catastrophe
http://dcgazette.com/muslim-inbreeding-may-genetic-catastrophe/#
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Combining his own research and several studies, Sennels says the genetic damage of such intermarriage, which is part of Islamic religion and culture since their prophet, Mohammad, allowed it, is causing lower intelligence (IQs), increased physical defects and greater incident of mental illness.
Almost half of Muslims worldwide are estimated to be inbred, with 70 percent of marriages in Pakistan, 67 percent in Saudi Arabia and 80 percent in Nubia in southern Egypt in consanguineous (blood-related) marriages to first cousins, to name just a few of the countries, he cites.
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Special education costs for slow learners consume a third of the budget of Danish schools, and Muslim immigrants and their children have a very high rate of unemployment because of limited skills, he says.
I think we found the solution to the moslem problem.
This is a huge problem. And, once again, no one wants to talk about it.