Question

What did calvinism hav to do with the 30 years war?

Answer 1

Many years ago, there had been what was called as the Wars of Religion which happened because of the intolerance within and among the religions in the state. Different religions where in competition with each other for the adherents. 

The introduction of Calvinism had profound implications when it comes to religious and political matters. Calvinism started seeping over the borders of Switzerland.