Science fiction is a literature of prophecy into the worlds of 'IF'.
The orthodoxies of all established churches have two contradictory things in common. First, at any specific time they believe that they represent the final and absolute word on the Creator and the duties of Man. Second they invariably keep shifting their interpretation of their doctrines to conform with the constantly altering conditions and politics of men. The essence of SF is that this is a changing world. In consequence SF reflects this.