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Where each religion is strongest 

Gosterra and Oinien: Yeparchism, as you agreed.
Khamria and Balúrail: Parethism, which you’ve set for Khamria. Both were settled from Bóinbile in the 200s and 300s ME, just after the split. That suggests Parethism spread among the emigrants, and perhaps helped drive the League’s independence in 289 ME.
Each armada carried its own faith. Tefar was strongest in the Gosterra armada and Uisla in the Hilisare armada (Luraskor). Chishin and Osiala arose on the continents afterward, once the Ascendant Spirits had taught humans Osia. That gives each continent its own religious character.