The film was a collaboration between writer and director, who honed out the content and structure together before filming.
The 'professional' contributors - musicians and writers - had all been researched and interviewed previously, and the interviews you see were based upon the previous meetings. The music performances were obviously staged, in a way that carried the content of the songs into the overall narrative.
The 'civilians' were mostly spontaneous, although some had been identified in the research trips. For example, the preacher in the first church was quite happy to tailor his sermon to the needs of the film - he had already stated the prime 'enemy' of his church was substance abuse, because it subverted the desire for the transcendental into a cul-de-sac. This suited the film-makers.
So everybody in the film was speaking their own words. The task of the writer was to provide a more-or-less coherent structure, and the director to express that cinematically.
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