Unfortunately, we might have the illusion of not needing any other abstract concepts to use for our social identity. Humans always do! If we don't believe in Democracy, then we must believe in the Catholic Church, or Fascism, or Moldbuggery, or Communism, or Direct Theocracy (like in Banks' Culture). But believe we will.

This sounds somewhat like the assertion, usually made by religious critics of science, that "everyone believes in something; your faith is in Science" (or Darwin, or the like). Would you care to distinguish these assertions?