Could you be more precise than ontologically basic mental entities, I've read over the Carrier article on the subject and more and more the concept appears like a subtle rhetorical trick - where the term (especially what qualifies as mental) takes on slightly different meanings at different times.

As it is, I'm tempted to treat the whole idea as dangerously shaky - especially as depending on your ideas of "mental" and "basic" you could consider thermodynamics to be unambiguously supernatural and the medieval Christian God as natural.

I apologize, though, as I realize is somewhat off topic. But it might be important to note that it is unlikely for pure Untheist to develop rhetorical strategies based on Theism without having encountered them before.