It's worth remembering that "no religion" or "no affiliation" is not akin to "atheist" or "agnostic."
Many of those people are very "culturally Christian" and hold socially traditionalist views on sex/gender.
I'd be willing to be that most of those people still
identify as Christians, even if they don't practice because as you said, they're still culturally Christian. Being a none is still the territory of those who are "spiritual and not religious" and are trying to make a statement against organized religion and the culture around it.
Anyway, to answer the question, I'd guess that there's likely no state where nones vote GOP - looking at
presidential and
midterm results from the last few cycles, Democrats regularly get high 60s to low 70s results with nones, which likely translates Dems winning them everywhere.
