“The theological challenge facing Nathan of Gaza and other Sabbatian thinkers changed dramatically late in 1666, when Shabbatai Zevi was summoned to the palace of the Ottoman sultan. He emerged from the meeting wearing the Muslim cap. Having been threatened, Shabbatai Zevi did not hesitate for long before converting to Islam. Judaism was suddenly faced with a situation in which the messiah committed the worst possible sin that generations of Jews were educated to avoid. One has, when faced with a demand to convert, to become a martyr and “sanctify the holy name” rather than betray one’s God, people and tradition. Shabbatai Zevi, who should have been the example of religious perfection and who was regarded not only as a divine messenger but also as a divine incarnation, did the exact opposite.”
Scholem later explained that this was not only deliberate, but necessary, including the “discovery” of numerous verses and statements in the Bible, the Talmud and the Zohar that indicate the necessity of the messiah’s conversion to an “evil” religion.
“Several thousands of Sabbatians followed Shabbatai Zevi in the last decades of the seventeenth century and converted to Islam… Most Sabbatians, however, remained within Jewish communities, and created an underground of believers in all strata of Jewish society, simple people, intellectuals, and rabbis. They imitated their messiah in a kind of “sacred hypocrisy:” They pretended to be orthodox Jews, adhering to the ancient exilic tradition, while secretly they worshiped the messiah and the Torah of the age of redemption.”
–Joseph Dan, Kabbalah: A Very Short Introduction, pg. 89-90.