or "mental/cognitive plasticity"

My thoughts exactly: this is generally referred to in the literature as mental/brain plasticity.

Coining a new term when a perfectly good one exists is unfortunate but happens, as see with the author here.

Edit: here's a link to neuroplasticity (aka brain plasticity):

https://en.m.wikipedia.org/wiki/Neuroplasticity

Creedoplasticity? Pisteuoplasticity?