So the first center of reform emerged

[Spikee78]

I want to snuff that out before it gains power, what should I do?

It's a neighouring 1 province nation, how hard can it be ... (from previous experience, very)

 

[Zohtun]

Invade. Pray that as few provinces convert as possible between now and when you finish the hellish experience that is converting that tiny province.

 

[Laurent1944]

Actually it is the simplest case for Austria: a reformation center in an OPM just on your border. Invade ASAP and chose at the end of the war the clause "Change religion" (or something close in words): the OPM leader and capital will become catholic, and this will remove the reformation center immediately.

 

[DonRoscoe]

If you kill the center a new one will spawn elsewhere, until there are 3 Centers for each reformed religion (Protestant and Reformed). So keep an eye on the religion map, and kill it every time it spawns in your area of interest. It's OK if they spawn at distant places. (Like Cyprus, where it can't reform shit).

 

[SPAMbuca]

I would be pretty pleased with it too. Assume you have to get rid of 6 centers in total. Having one this close is really easy. It's also not a free city so you can attack it directly. Fabricate a claim and just force religion. With some luck, you can also convert some other nations back.

 

[Laurent1944]

If you kill the center a new one will spawn elsewhere, until there are 3 Centers for each reformed religion (Protestant and Reformed). So keep an eye on the religion map, and kill it every time it spawns in your area of interest. It's OK if they spawn at distant places. (Like Cyprus, where it can't reform shit).

AFAIK a converted reformation center did not spawn again, but I only killed one when the three for one given reformed faith were on the map. It did not come back (and the HRE was a considerably more catholic place compared to usual game).