Just the name tells you. It was Catholic and still is home to the Pope.
Roman Catholicism
Chrisianity
None.
Voltaire said the Holy Roman Empire was not 'Holy, Roman, or an Empire.'
the holy roman empire was not holy, roman or an empire - Voltaire
Germany was part of the Holy Roman Empire. But was not the Holy Roman Empire.
Rather superficial. Officially the religion was Roman Catholicism, but the rulers largely did what they wanted.
The Emperor Constantine, who was the ruler of the eastern empire, converted to Christianity and made it the state religion. This began the Holy Roman Empire.
Peace of Augsburg
The holy Roman empire ruled the Romans.
Holy Roman Empire was created in 962.
One possibility would be the formation of the Holy Roman Empire (which was unfortunately neither Holy, Roman, nor an Empire).