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Seriously, ever hear of Tay-Sachs disease? Please explain to me how a religion can cause a genetic disorder?
Do you know that the last name Cohen indicates a priest, and to this day DNA testing shows a close family relationship among Cohen's around the World?
How exactly do an entirely converted people spread throughout the World share genetic code?
Nobody is denying that some people converted to Judaism, and the religion accepts such converts as full members of the race as well, but the vast majority of Jews are related by DNA, and that can only be explained by descending from a common people with little interbreeding from outside the community.
BTW, do you think a naturalized American is somehow less an American than someone born American? If not, why does this double standard apply to Jews?