Karaites put the Old Testament before Talmud/Rabbinic law and consider themselves Jews. Would you say that Protestants are not Christian because they put Bible above the Church tradition and commentaries?
Good comparison, A. Pole. Talmudists and Kabbalists are to Judaism as Roman Catholics are to Christianity. Or, as as Mormons are to Christianity. Or, as the Sunni Muslims are to Islam.
Karaites, Protestants, and Shiites make the same claim in their respective religions. Aka the original teachings had become corrupted, overlain with human tradition, a departure from the original teachings of their respective religions.
May all freepers forgive me for including the Muslims in this. I did it only to make my point. They are not even in the same league with Judaism and Christianity. Sunnis, Shiites, Sufis, whatever.
The basis of Judaism and Christianity is the same revealed word of God, the Tanach to the Jews, the Old Testament to Christians. Islam might have the same claim, however, the Koran is but a syncretistic amalgam, clearly bogus.