He would have been surprised, and none too pleased, to see us supplying him with ideologies he chose not to have.
A higher threshold would force the two to remain in allegiance even amidst serious departures in ideologies.
But religions and ideologies are the opposite of flexible and compromising.
1796, "science of ideas," originally "philosophy of the mind which derives knowledge from the senses" (as opposed to metaphysics), from French idéologie "study or science of ideas," coined by French philosopher Destutt de Tracy (1754-1836) from idéo- "of ideas," from Greek idea (see idea) + -logy. Later used in a sense "impractical theorizing" (1813). Meaning "systematic set of ideas, doctrines" first recorded 1909.
Ideology ... is usually taken to mean, a prescriptive doctrine that is not supported by rational argument. [D.D. Raphael, "Problems of Political Philosophy," 1970]
ideology i·de·ol·o·gy (ī'dē-ŏl'ə-jē, ĭd'ē-)
The body of ideas reflecting the social needs and aspirations of an individual, a group, a class, or a culture.