The meme is real, but it's not quite what the Foundation thinks it is. Knowing the religion's practices does make them anomalously appealing… unless you happen to be missing an eye, in which case they become anomalously unappealing.
Consequently, they characterize all the (fairly innocuous) practices of SCP-5586 in the most negative light possible. Those rituals? That's just praying for safety and a good harvest. Chronically toxic fumes? Smoking weed. Concealing SCP-5586 to infiltrate? No, they're just not a proselytizing religion. Self-immolation? Okay, that bit is kind of odd. The translations too are bent in this way. I don't know Kurdish, but I played around on Google Translate until I got combinations that seemed about right. Qiral Erîbav is something close King Father-est, pretty close to the sort of appellations given to the Abrahamic God. Father could become Sire and King could become Tyranny, but that's some seriously motivated translation going on. Similarly, Milyak is more like angel than the less-positive prince. And these things have no association with the various awful entities the Foundation thinks they do. (Note: Again, I do not know Kurdish. These aren't intended to be quite real Kurdish words, but let me know if they sound egregiously off.)
This goes beyond simply hating the Children of Ash. Folks affected by SCP-5586 who are missing an eye will also be opposed to the individual practices of the religion, even those that exist in completely different contexts. Hence why the article is so strongly in favor of the foods that happen to be taboo to Children of Ash. (That said, Syrian rhubarb did sound like a pretty good vegetable.) Harmless here, but it means that they also object to more broadly accepted things like smoking and praying. And because the doctrine of the Children of Ash holds that Yek’kûl Girta is the source of evil, they conclude that it must be a good thing. Worst of all, where the Children are non-proselytizing, the people affected by the reverse meme think spreading it is the right thing to do.
Is there any reality at all to the religion of the Children of Ash? There's not intended to be more than there is to the typical religion in the Foundation-verse. I wouldn't be averse to another author deciding differently though.
I had sketched out a more detailed plan for Procedure 5586-Revelation, but cut it because I didn't think it added much. Basically, it entailed using 076's blood to key basically a voodoo doll to everyone, then removing an eye from the effigy.
I don't have any plans for the cave of carnivorous diamonds, so if anyone wants to write that, I'm probably happy to incorporate it.
