No, apparently black people and jewish aren't even people. The White Man is descended for Abel, who was the product of the union between Adam and Eve. The Jews are descended from Cain, who was the product and Eve and the Serpent. I'm not sure where the explaination of the Black Man comes into it.
HOWEVER, Judaism is passed through the mother, so if a Jewish man has a child with a non-Jewish wife, that child can join the KKK.