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Well if you are going to rate 'external threats associated with a religion' like Islam up there, you'd have to include Jews. I doubt the muslims who sacked Byzantium were especially observant.
The Unitarians are kooks, but few in number, even taking the ACLU alone as an example, the number of leading Jews in the organization will far outstrip Unitarians, and the amount of money from Jewish donors will far outweigh that of Unitarians.
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