to barge in and add my late two cents:
i think that whether your book is fiction or non shouldn't be a real question. the greek philosophers didn't want to drill truth and facts into people's heads and let it go at that. the idea was to question, and push others to question as well. the reason i talk with others about certain subjects is not to convince them of anything or to force my opinions on them, but to get them started on their own trains of thought so that they can take the process a bit farther.
thought anarchy. whee.