SF is about the mythos of science

From the beginning of time humanity connected to a collective sense of meaning through myths & stories. In the West, a lot of our identity is shaped by Christian stories. 

With the advent of technology, we moved away from superstition and embraced rationality & technology. SF in a way is plucking that hole, discussing the philosophy of science. Dune, for example, shares a lot of its narrative ark with Jesus's hero journey but replaces the historical background of Ancient Rome with space feudal lords.