I think something like Religion could be termed Constructuralism, largely because it is a construct of original ideas that are largely false that has become a set of opposing beliefs.
The opposing beliefs that Religion as a Body is original I think demands a word like this.
It kind of sinks the lofty illusions/beliefs of what Religion is in one word.
The antithesis of this word might be Deconstructuralism. In other words Deconstructuralism of Constructuralism.