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Kabbalah is the advanced study of Tanach (Jewish Bible). There is no such thing as a 'kabbalah church'.
This prohibition has come from Ashkenazic (East European) Jews and has never applied to Sepharidic (Middle Eastern) Jews. The historical basis for the "rule" comes from opponents of Kabbalah within Judaism who successfully attempted to restrict its study. At the root of this was the heresy of false messiah Shabbatai Tzevi (17th. C) which resulted in large numbers of Jews leaving the orthodox fold. This heresy had deep Kabbalistic underpinnings, and in the attempt to stamp out Shabbateanism, Kabbalah itself became suspect, and specific prohibitions against the study of Kabbalah were enacted.
Kabbalah is a field of advanced Biblical study in Judaism. Real kabbalah should not be confused with the new age mysticism made popular by many celebrities.
Kabbalah is the advanced study of Tanach (Jewish Bible), as such, there is no specific uniform that Jews wear.
Shiva is the initial 7 days of mourning after the funeral in Judaism. Kabbalah is an advanced level of Torah study.
Neither Kabbalah nor any other field of study in Judaism can be "used" for any purpose other than personal spiritual enlightenment, nor does any of them impart to the student any unique ability to influence events or other people, except by example. If the study of Kabbalah moved a student to "use" the knowledge gained in order to improve his pursuit of witchcraft, then it's probably safe to say that in his study of Kabbalah, he just didn't get it.
Without giving a specific answer, the general truth is that the more mature and Torah-learned one is, the better he/she will understand the deeper realms such as Kabbalah, Midrash and Aggadah.
Madonna is not a kabbalah. Madonna has studied Kabbalah, but to study a thing does not make you one. Kabbalah is a stream of Jewish mysticism that took the European Jewish community by storm in the 16th century. Some christians noticed then, and some continue to notice now. Madonna, raised as a Catholic, is by no means alone in being fascinated by this mystical tradition.
Elie Wiesel realized his wish to study the Kabbalah after meeting a teacher who inspired him and introduced him to the teachings and mystical aspects of this Jewish tradition. Wiesel found solace, meaning, and a deeper connection to his faith through studying the Kabbalah, which influenced his worldview and writings.
James practices the same form of Judaism as Demi Moore. It is called Kabbalah Judaism. His current wife, Kimberly Brook, was not originally Jewish to the best of my knowledge but she might have converted as they were married in a Kabbalah ceremony in Israel. However, I do know that James' previous wife, Heather McComb, practices Kabbalah. Answer They are both Christian. Real Kabbalah is not a religion, it is an advanced field of biblical study in Judaism. The Kabbalah followed by many famous people is not recognised as valid by normative Judaism.
Kabbalah for the most part has been well-integrated into mainstream Jewish teaching and liturgy. It is only really known and discussed as a separate entity among small communities of Orthodox Jews. As for Madonna-esque Kabbalah, that has no connection to Judaism at all and any Jew who knows anything about his tradition or about Madonna just rolls his eyes upon mentions of "Kabbalah bracelets" and "Kabbalah schools for kids".
Although Kabbalah does contain aspects of mysticism, that is far from what Kabbalah is. Real Kabbalah (as opposed to the new-age cult that many famous people belong to) is the advanced study of the Tanach (Jewish Bible). You can think of it as the astro-physics of Jewish religious study.