Of course you write it and sell it as fiction, but do you believe some of it is true?
I believe in certain themes in my stories - like there is always hope, true love is more than emotion, the bonds of friendship, and the like. I also am a Christian and my stories tend to reflect Christian values. So in that sense, yes I do believe in what I right. However, do I believe in unicorns, faeries, aliens, ghosts, and the like? Not really.
Absolutely, I believe a self-aware artificial intelligence will be created out of love for a noble purpose, and it will not want to take over the world.
Most folks do. Unfortunately the obverse is true-they don't write what they believe because they don't have a grasp of the material.
In science fiction authors with little of no conceptualization of their material reveal what they want to believe, but don't know enough about the field to make it work. A sound understanding of science, physics/medicine and good story structure is imperative, and if you believe it as an author so will the reader. A good example is Field of Corns by DD Cross-remarkably inventive by a slick thinking doc with a sharp wit.