Being a Triunist means he views SA as a variant; it's a short step.
Hireshmont was a priest and elder of Triunism.
Medieval nobles converted for gamey reasons. It's very SMA to adjust your religion for political reasons.
That's true. I mean he did argue the fact that he's a variant of SA to many.
Nonetheless, I just don't think it's Kale's character, he has always been quite honorable.
Also, it would alienate most of the friends he's built up. Would just be a bad move.
Even more so because where as Kale before had no qualms with Astroism and was actually quite the friend and ally to the religion (indeed only seeing it as a variant of his own) he is now bitter and feels betrayed and that the Church has shown its corruption.