Question

who sparked the 30 year's war?

Answer 1

What sparked it? The change in religious services started by Luther and his allies. The Catholics, including the Pope, and his king of the area, Charles, didn't like it.

Answer 2

Here are some excellent sites on the Thirty Years War. Particularly, check the first three.

http://www.google.com/search?hl=en&ie=ISO-8859-1&q=Thirty+years+war&btnG=Google+Search