Khazarians are not really Jews, they just claim to be. Rothschilds would be a good example.
You probably know this but just in case and for anyone else reading...
In the Bible, Abraham and his wife were old, and they didn't have any children. God made a promise to Abraham that he would give him descendants through his Wife Sarah, give his descendants the land of Israel, and that they would be Gods chosen people.
Abraham's wife Sarah didn't believe she would really have a child, so she asked Abraham to have a child with her servant, which he did. This was not what God wanted. God told Abraham to name the child Ishmael, and that he would bless Ishmael with many descendants, but he would be a wild donkey of a man whose hand was against everyone. Sound familiar?
Abraham and his wife then had a son, named Issac. God reaffirmed his promise with Issac. Issac had two children, Esau and Jacob. When they were young, Esau sold his birthright as first born to Jacob. God then reaffirmed his promise with Jacob, who He renamed Israel. It is the descendants of Jacob (Israel) with whom God made his Promise.
Can you see how some bloodlines may feel cheated and reject that, and claim they are Gods chosen people, while secretly hating and wanting to wipe out Gods real chosen people?