猶太人沒有真正的基因標定。祖上信猶太教，後代就成為猶太人後裔

Marx和Lenin的所謂是猶太人，都是因為祖先有某一支有過信教的猶太人。

 

至於他們本人，Marx父母在他出生前就成為了基督教徒。所以，他根本不能被稱為猶太人。“Marx's family was originally non-religious Jewish but had converted formally to Christianity before his birth.”

 

至於Lenin，他更是堅定的anti-nationalist

https://www.quora.com/Is-it-true-that-Lenin-said-An-intelligent-Russian-is-almost-always-a-Jew-or-someone-with-Jewish-blood-in-his-veins