It probably depends on whether he's studied the Achura to speak of. Canonically, the Achur faith has a downright silly number of sects, with a few key points in common (the Creator, or the White Song, for example) and LOADS of disagreement.
I think of the sect as on the high-end of mid-sized, representing a majority of Achur believers in a few regions. It would stand out to a scholar for its particularly unsentimental view of traditional religious stories, but differs much less from other sects on the level of lay practice (it's easy to endlessly repeat that you believe in the seamless unity of the universe and the fictitious nature of the self without properly understanding what the hell you're saying).
As a side note, I wouldn't have written this if I desired this information to be IC unobtainable, or even difficult to access. I wouldn't call it "well-known" off Saisio, but it's certainly easy to research.
Think of it as about the level of RL knowledge necessary to not only know that Taoism exists, but roughly what it says. Otherwise, it would sort of fade into the general Achur religious fog.