So with the naive realistic interpretation of reality do you not agree that the standards set by the Missionaria Protectiva are pretty high to be applicable to reality?
I think that the Bene Gesserit might have had a naive realistic view.
I don't think that the Guild Navigators, Paul or Leto did as portrayed in the novels.
I think that for the Bene Gesserit they may have had some "faith" in something else, but they relied only upon a naive realistic view in practice.
Mind was built up to through nature for the sisterhood.
The approach of the Guild Navigators was to construct nature from consciousness, to make the reality from the mind.