Many Minmatar who leave for the Republic (for the most part they do not return and had never set foot there) retain their faith, I doubt given the tribalism you wear on your sleeve that you have much experience with the faithful even in the Republic.
It is thus surprising to me to hear such authoritative comments on the disposition of vast swathes of the imperial population, it may be that Kernher’s heresy is growing. When almost none of the commons much less slaves have ever heard of you, there is a lot of room for limited growth.
Your invocation of the anger of Duke Chakaid of Fabai, and the efforts of Chapter Master Lok’ri to counteract elements of her heresy as proof of its success is flawed. The Duke’s anger is known to be ‘triggered’ by her actions and based on my reading of the Chapter Master’s arguments his priority isn’t addressing heresy so minor as to be relevant only in principle but the transactional theology underpinning it. A system based upon the theology of false promises imparted to Kernher offers only more hypocrisy.