1) Sort of? Wanted to go for the vibe of the state atheism of Oceania while fitting it in with TTL's fascist fundamentalism, so decided it'd be a fun take for the BU to extend its materialist/dirty 30s vibe right down to their fundamentalism, treating even their religion like some bizarrely specific and grotesque quota - "Sixty purifications by Monday, Colleague-Patriot Jones, or I find a new regional director for the spiritual and fluidic fortification of Birmingham, understood?" (note: substituting colleague for comrade on similar grounds to BU's Not-Christmas being Cromwellsmas rather than Patriot Saints' Day)
To be more specific, Sin Reduction Zones were designed, like most things in the BU, to accomplish two distinct purposes at once: to gain Jehovah's favour, unite the nation and stiffen its nerves through shared sacrifice, and to give the elites a mechanism through which to demonstrate their status and fuck with their rivals. I like to imagine there was a huge arms race of who could burn the most pre-revolutionary antiques before NatPar stepped in and organised an fundraiser instead
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Penitence Sales are their successor, and far more aimed at the Dregs and their social class, trapping them in something ironically like the indulgence scam the Catholic Church ran before the Reformation - only this time, it's hideously statistical, isn't a one-and-done thing, and is directly aimed at sapping that class of any surplus cash to prevent them challenging the elites of NatPar.
2) Both went into it, yeah - thought it especially fitting since WH40K is a British franchise IOTL. On another note, thought the focus on physical and mental hygiene would be very in character for a country at the heart of very dirty anthrax leaks/chemical weapon campaigns, so take that as you will.
3) Yup.