What were the causes of the Thirty Years' War?

The reason for the battle of the Thirty Years' War was to battle for religious control of Holy Roman Empire.

The Thirty Years War was caused by the split of the Catholic Church, oterwise known as the Protestant Reformation. Cavin's 95 Theses brought church corruption to the forefront of European's minds and the slpit caused political and religious strife, the Thirty Years War.