So the Sabbatai Savi religion came to an end, and survives only in the tiny sycretic sect known in Turkey as the Donme, which conceals a Jewish loyalty within an outward Islamic observance. But had its founder been put to death, we should be hearing of it still, and of the elaborate mutual excommunications, stonings and schisms that its followers would subsequently have engaged in. The nearest approximation in our own day is the Hasidic sect known as Chabad, the Lubavitcher movement once led (and according to some, still led) by Menachem Schneerson. The man's death in Brooklyn in 1994 was confidently expected to produce an age of redemption, which it so far has not. The United States Congress had already established an official "day" in Schneerson's honor in 1983. Just as there are still Jewish sects who maintain that the Nazi "final solution" was a punishment for living in exile from Jerusalem, so there are those who preserve the ghetto policy which maintained a watcher at the gates, whose job it was to alert the others if the Messiah arrived unexpectedly. ("It's steady work," as one of these watchmen is supposed, rather defensively, to have said.) Surveying the not-quite and might-have-been religions, one could experience a slight feeling of pathos, were it not for the constant din of other sermonizers, all of them claiming that it is their Messiah, and not anybody else's, who is to awaited with servility and awe.
Christopher Hitchens, God Is Not Great: How Religion Poisons Everything (172)