It would allow them to have better chances of increasing status/wealth in society.
Strong nationalism
The Jews were always proud of their nationality which they held as divine ordained through the promises Yahweh had given their patriarchs Abraham,Isaac and Jacob. This sense of divine significance maintained their spirit of nationality that has survived and spanned three millenniums.
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Because it shows Stalin and Hitler married, they are supposed to represent communism and fascism, political concepts that strongly oppose and contradict one another
I think the answer would be true. Cultural bonds like people who share the same religion are an example of what makes up a formal region. Religion is a trait of a culture and mostly people following the same culture or traditions would have the same religion and would live in the same area making up a region.