The dominant religion in Germany has been Christianity since the early Middle Ages, when the region was the heart of the Holy Roman Empire. In the 16th century, the nation was the center of the Protestant Reformation, led by Martin Luther.
Today, Christian Germany is about half Roman Catholic and half Protestant, with Catholicism having a slight majority as of 2018. But even more Germans identify as nonreligious or unaffiliated than as Christian.
Islam is on the rise in Germany, like elsewhere in Europe, and is expected to grow even more in the near future.