I infer that "Promethean mind" refers to one who shares the "light" with mortals or one who seeks or benefits from receiving the "light." I further infer that the term is meant to connote one who is a materialist.

Materialists, like religionists, are not of one mind on how to approach the subject of faith. Most of us don't have a problem with other people having and expressing their faith - so long as they don't expect the rest of us to play along with it.