Southern Slavs mostly identify with religion, so wouldn't it make sense to have Bogomilist Slavs as Bosnians?
Catholic=Croat
Orthodox=Serb
Bogomilist=Bosnian
I don't think Paradox wants to add a small Christian heresy into the game though, I wonder how could we represent the Bosnian Church without adding new features etc.
Bogomolist already is in the game, the converter files technically, but it already has features.
Bogomilist
Bogomilism is an originally Orthodox Christian heresy with Gnostic elements that completely rejects the ecclesiastical hierarchy and advocates a return to early Christianity. Bogomilists believe that the world was created by an evil demiurge - the Devil.
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−10% Stability cost modifier
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+10% Morale of armies
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Church Aspects, as with Protestant
- Halved relations penalty from non-Bogomilist Christians (they consider the Bogomils to be "misguided heretics")
All Bogomilist provinces receive:
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−1 Local unrest
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−2% Local missionary strength[2]
A heresy of Orthodoxy in CK2, a Gnostic sect that spread through the Bulgarian and Eastern Roman Empires from the 10th century.
If taken as a secondary religion, it provides the following bonuses.
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−10% Stability cost modifier
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+1 Tolerance of the True Faith