I have the following problem: I started as Teutonic Order and I wanted to create Prussia. Therefore you need to convert to Protestantism. When the big wave came and the provinces started to convert automatically I couldn't change my state religion because of the increasing instability caused by it - I was at war.
A couple of years later I switched the religion to Protestantism and changed my country to Prussia.
But I have to convert EVERY SINGLE county in my country with my missionary. I just have one and the quickest provinces take about 20 months to convert. I think for the last 100 years my troups do nothing but slaughter catholic rebels - even though I have an overall stability of 2 or 3.
There must be some way to do this more quickly, right? My neighbouring countries basically switched over night - including their provices.
Any ideas what I might be doing wrong?