Judaism is NOT about race at all and the Germans are the ones who made it about race. In Judaism there is no such thing as 1/2 Jew or 1/4 Jew, you are either a Jew or NOT...
If your mother was a Jewess and she bore you, you are a Jew. If your mother is not a Jew you are not. The Torah clearly states this and it is an easy way to know who is a Jew and who is not.
Anyone can convert to being Jewish as long as they go through the halachic requirements to be declared a Jew. The Torah explicitly commands us to treat the convert just like a 100% born Jew, and the offspring of the convert is 100% Jewish. Many of our great Rabbis of the Talmud period (including Rabbi Akiva) were born from converts.
Both my mother and father were Jewish and thus I am Jewish. My brother was Jewish, his wife was not, so his two children are NOT Jewish (of course my mother wants to believe they are 1/2 Jewish and we argue about it from time to time).
Jewish people prospered in the four corners of the world and established diaspora communities in virtually all 70 nations... Thus we have Jews who do not share DNA or looks and yet we all share the Torah and the spirit of the Jewish people with us.
UJ, I know the speeches of Rabbi Kahane and have read much of his writings and I do not know what you are referring to concerning Rabbi Kahane (Zt'l) speaking about a Jewish race. Please provide us a reference rather than suggesting something which appears incorrect based on Jewish belief.
And by the way, we all know that those called the Black Hebrews are not Jews... None of the real Jews recognize them as anything but a cult created several years ago for black men (like the fake Nation of Islam)... That said there are many righteous black Orthodox Jews and I consider them part of my community and pray and celebrate Yom Tovim with them.