The political need met by this shift to feudalism was that the people of western Europe had issues with security and needed a source of protection from threats.
This led to the political aspect of the people who were rich and wealthy providing enough security for the populace while the people from the lower class ensured they were submissive to the rich class as a means of exchange and appreciation.
The name of God used most often in the Hebrew Bible is the Tetragrammaton (YHWH Hebrew: יהוה). Jews traditionally do not pronounce it, and instead refer to God as HaShem, literally "the Name".