Since the heyday of Billy Graham in the 1950s to the 1980s, Protestantism has evolved mostly to become silent on secular issues or to speak only to promulgate politically correct (PC) proclamations depending on the trendy issues of the day. 

The study of the nature of reality leads to the Medieval argument (conflict) between Realists and Nominalists. I will defer further discussion on that controversy for now, and instead, deal with more contemporary philosophies.

Pragmatism or Idealism