"Jews have come from all over the middle East/Med/Africa. Only the most orthodox only marry within their religion. What you have said is incredibly ignorant."
Read below to see with whom ignorance lies 
Jews originally come from the Middle East. [http://en.wikipedia.org/wiki/Genetic_studies_on_Jews Genetic studies on Jews]] has shown that they are overwhelmingly Middle Eastern. Despite the migrations, for example Ashkenazic and Sephardic Jews have been shown to be very similar genetically, although they have obviously been separated for a very long time. Same for North African Jews, who test genetically very close to European Jews. From the link above, also note that:
"The scientists found that the Jewish populations of North Africa became genetically distinct over time, with those of each country carrying their own DNA signatures. That suggests they mostly married within their own religious and cultural group said Ostrer. "They lived in ghettos," he said, "so their mobility was quite restricted, and by marrying each other they became as closely related as first cousins once removed." (note how not "only the most orthodox" marry other Jews)
It is possible to genetically distinguish Jews in a European population. See study here, aptly called "A genome-wide genetic signature of Jewish ancestry perfectly separates individuals with and without full Jewish ancestry in a large random sample of European Americans".
I hope that helps
Needless to say, there is no ethnic connection between say black African Muslims and white Turks with green/blue eyes whose ancestors came from Central Asia. You cannot possibly compare Jews which are an ethnic as well as religious group who have mostly married among themselves and have had relatively few conversions and Muslims (or Christians) whose ethnic heritages are from all over the world and many of whom have been converts in conquered lands etc.