Personally, I like "Idiotarian", at least as an internal shorthand - the fact that it's inherently insulting is a plus, not a minus - but I agree that it's not precise as a general use term that's intrinsically understandable by the casual reader.

I'd like to propose "antirational" [and "antirationalism" as descriptive of the phenomena]: describes someone who willfully pursues a counter rational philosophy, even though they're capable [in other areas] of applying rational thought to situations. The antirational person goes to great and often strident lengths to bolster agruments and positions that even casual observers can see on examination bear no resemblance to fact, data, evidence or any other basis other than "faith".

"Antirationalism" describes a philosophy of denial based upon adherence to viewing the world and reality as one would like it to be, rather than as it is.

I'm not sure that "evil" and "immoral" should be a part of the definitions: those are often by products of pursuing an antirational stance, rather than inherent to the antirationalist.

It has the benefit that "idiotarian" lacks: a casual reader can look at the term in context, and deduce from the root words and context the definition, whereas idiotarian can be fuzzy even in contextual use.

Sherman Barnes