What with these kinds of claims popping up on HN all the time whenever an Ancient Egyptian related theme comes up.
Copts (Christian Egyptians who still use a form of Ancient Egyptian as their litigurical language) and Muslim Egyptians are genetically indistinguishable, and have been living side by side for generations.
Islam is a religion, and "Arab" is a linguistic identity that is still in the process of forming into a truly ethnic identity despite Khalil Gibran's (a Lebanese Christian American) efforts in the early 20th century.
This is how a Kurd can become the symbol of Arab nationalism (Saladin), a Central Asian Persian the symbol of Islamic science (Al-Khwazrimi), and a Iberian Jew one of the premier physicians and philosophers (Maimonides).