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How would one go about making a Slavic country predominantly Protestant? By protestant I mean close to what we understand as such though I guess you can tweek it a bit.
The problem I see is that these countries were either Orthodox so switching to Protestantism is not going to happen as there is no incentive to do it. Or they were dominated by Austria which will not tolerate it. Maybe if Hussites win decisively and also get large degree of autonomy? But if Reformation kicks in OTLish they could be seen as "basically same" and attacked later?