Muhammad married his son´s wife Zeinab who was also his first cousin. This sunna is so popular in muslim countries that over 50% marriages are with first cousins.
The results are devastating.
Nicolai Sennels is a Danish psychologist who has done extensive research into a little-known problem in the Muslim world: the disastrous consequences of Muslim inbreeding brought about by the marriage of first-cousins.
The practice of marrying close relatives, which has been prohibited in the Judeo-Christian tradition since the days of Moses, was sanctioned by Muhammad and has been going on now for 50 generations (1,400 years) in the Muslim world.
Consider the following:
True Orthodox Polemics, Muslim Inbreeding
According to Sennels, close to half of all Muslims in the world are inbred. In Pakistan, the numbers approach 70%. Even in England, more than half of Pakistani immigrants are married to their first cousins, and in Denmark the number of inbred Pakistani immigrants is around 40%.
The numbers are equally devastating in other important Muslim countries: 67% in Saudi Arabia, 64% in Jordan and Kuwait, 63% in Sudan, 60% in Iraq, and 54% in the United Arab Emirates and Qatar.
According to the BBC, this Pakistani, Muslim-inspired inbreeding is thought to explain the probability that a British Pakistani family is more than 13 times as likely to have children with recessive genetic disorders. While Pakistanis are responsible for three percent of the births in the UK, they account for 33% of children with genetic birth defects.
Lowered intellectual capacity is another devastating consequence of Muslim marriage patterns. According to Sennels, research shows that children of consanguinous marriages lose 10-16 points off their IQ and that social abilities develop much slower in inbred babies.
The risk of having an IQ lower than 70, the official demarcation for being classified as “retarded,” increases by an astonishing 400 percent among children of cousin marriages.
In Denmark, non-Western immigrants are more than 300 percent more likely to fail the intelligence test required for entrance into the Danish army.
Sennels says that “the ability to enjoy and produce knowledge and abstract thinking is simply lower in the Islamic world.” He points out that the Arab world translates just 330 books every year, about 20% of what Greece alone does.
In the last 1,200 years years of Islam, just 100,000 books have been translated into Arabic, about what Spain does in a single year. Seven out of 10 Turks have never even read a book.
Sennels points out the difficulties this creates for Muslims seeking to succeed in the West. “A lower IQ, together with a religion that denounces critical thinking, surely makes it harder for many Muslims to have success in our high-tech knowledge societies.”
Because of their massive illiteracy, ignorance, and low IQ, most of the Muslim world believe that their religion is supreme and that Muslims are superior to all other peoples. Equally absurd, they believe it is morally just and right for Islam to rule the world.