General we had 4 types of slavic paganism.
1. Pommeranian paganism. Theology based on cult of Sun and Thunders. Central point of religion in Arkona. Priesthood in caste-style. High influences of catholicism and german culture. High militarism and very intolerant.
2. Russian paganism. Vladimir's pantheon. High influences of shamanism and nordic paganism. Very tolerant and missionary. Двоеверие
3. South-slavic paganism. Theology based on dualism (like in manicheism). High influences of catholicism, orthodoxy and italo-byzantine culture. Ability to assimilate (for many historians "bogomilism" is christianity with elements of south-slavic-pagan theology).
4. Rest-slavic-world. Every family or village can have own concept, father of family can also work as priest etc. Generally great prymitivism and lack of any deep concept.
This is only for informations. IMO - there haven't sense. Next religion, which is only aesthetics, isn't needed.
In my mod (Better Slavic Pagan Mod) is other mechanism of reformation (decisions-events). IMO - this is more rational. Also in my mod is many differences between unformed and reformed. You can try this
1. Pommeranian paganism. Theology based on cult of Sun and Thunders. Central point of religion in Arkona. Priesthood in caste-style. High influences of catholicism and german culture. High militarism and very intolerant.
2. Russian paganism. Vladimir's pantheon. High influences of shamanism and nordic paganism. Very tolerant and missionary. Двоеверие
3. South-slavic paganism. Theology based on dualism (like in manicheism). High influences of catholicism, orthodoxy and italo-byzantine culture. Ability to assimilate (for many historians "bogomilism" is christianity with elements of south-slavic-pagan theology).
4. Rest-slavic-world. Every family or village can have own concept, father of family can also work as priest etc. Generally great prymitivism and lack of any deep concept.
This is only for informations. IMO - there haven't sense. Next religion, which is only aesthetics, isn't needed.
Reformation as it is have absolutely no sens, and is boring to play. It should be character related - be independant, have <20 learning, have a temple vassal with 15>Learning, have 500 piety. It should not be instant, instead it should trigger a period of instability (malus to relationship with your vassals and give a special CB on you to your same religion neighbourg for 5-10 years). Or perhaps even several wave of negative events, a bit like westernization in EU3.
In my mod (Better Slavic Pagan Mod) is other mechanism of reformation (decisions-events). IMO - this is more rational. Also in my mod is many differences between unformed and reformed. You can try this