Religion gives rise to wars even when there is no state religion. But when there is a state religion, it can even more easily lead to genocide.
The later anti-Semitic writings of Martin Luther had a role in the Holocaust. Nazis used these 500 year old writings to justify their genocide against the Jews.
www.macleans.ca
Here's what Luther wrote:
German Protestant churches are grappling with this fact to this day
This topic is pertinent now, because of the 'Russian World" myth embedded in Russian Orthodox theology is being referenced by Putin to justify wars
publicorthodoxy.org
In the Russian/Ukraine War thread, a number of very thoughtful posts were made about religion.
Those posts have been moved here, and a general discussion of whether church and state should be separate, and also whether the state should discourage religion, as was done in the old USSR.
Is religion useful or harmful in modern life?
The later anti-Semitic writings of Martin Luther had a role in the Holocaust. Nazis used these 500 year old writings to justify their genocide against the Jews.

The Reformation at 500: Grappling with Martin Luther's anti-Semitic legacy - Macleans.ca
Opinion: On the Reformation's 500th anniversary, what lessons have been learned from the virulent but influential hatred of a foundational church figure?
Here's what Luther wrote:
In 1543, he published “The Jews and Their Lies,” which today is shocking in its venom, and even for its time stood out as particularly cruel and intolerant. In the 65,000-word treatise, he calls for a litany of horrors, including the destruction of synagogues, Jewish schools and homes; for rabbis to be forbidden to preach; for the stripping of legal protection of Jews on highways; for the confiscation of their money. The Jews are, wrote Luther, a “base, whoring people, that is, no people of God, and their boast of lineage, circumcision, and law must be accounted as filth.”
German Protestant churches are grappling with this fact to this day
This topic is pertinent now, because of the 'Russian World" myth embedded in Russian Orthodox theology is being referenced by Putin to justify wars

Patriarch Kirill, the "Russian World" Myth, and Genocide
by Jaroslav Skira | ελληνικά | Română | Русский | Српски Also available in Ukrainian (pdf) Suggestively linking a Russian Orthodox primate, an ideology, and genocide may seem provocative or sensationalist. For me, given the current unjustified Russian war on Ukraine, the connections between them...

In the Russian/Ukraine War thread, a number of very thoughtful posts were made about religion.
Those posts have been moved here, and a general discussion of whether church and state should be separate, and also whether the state should discourage religion, as was done in the old USSR.
Is religion useful or harmful in modern life?