Rabbi Boteach has spoken out against Madonna's use of Kabbalah several times, for example:
Perverted Priorities (Madonna is mentioned near bottom of page)
After Madonna's press person, Liz Rosenberg, made a public statement blasting Boteach, he wrote this follow up piece:
Rabbi Boteach responds to Madonna's p.r. spokesperson Liz Rosenberg
She already offended Catholics in the 1980s. In the late 1990s, she went through her "Hindu" phase and angered some Hindus. A couple of links about it:
VNN USA - Madonna's MTV Performance Offends Hindus
E! Online News - Madonna's New Holy War
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awww... look its flea dip promoting his/her site once again... aww... sooooo cute...