They are just following the basic practice of business.

Yep its just business. Gibbon proudly says without fear or favour it's just business. Whatever Gibbon.

so as to why NZ atheists here are essentially trying to import that problem into the country, along with its accompanying culture war, is beyond all reason.

Well I'm glad for you that you live in a vacuum and 2000 yrs of religious stupidity has never sullied your life.
Where is this New Zealand you speak of? Where the pious and the heathen live together in perfect harmony, and culture wars rage somewhere else? And I would have thought "the problem" had pervaded all corners of the globe, tho' obviously not your corner. This is a debate, and how it is resolved, that should not be put off and we should all try to pay attention, keep abreast developments, and not say it's someone else's problem.
And you talk of reason, yet your every words drips of superficial thought and avoidance.