I thought you would say something like that, so here ya go, which of these were nothing to do with religion
"US Western Expansion (Justified by ""Manifest Destiny""):20,000,000 deaths"
AIDS deaths in Africa largely due to opposition to condoms: 30,000,000 , ok not a war but deaths caused by religious opposition to condoms
Al Qaeda, 1993-
Albigensian Crusade, 1208-49
Algeria, 1992-
Arab Outbreak, 7th Century CE
Arab-Israeli Wars, 1948-
Armenian Genocide: 1,500,000
Atlantic Slave Trade (Justified by Christianity): 14,000,000
Aztec Human Sacrifice: 80,000
Baha'is, 1848-54 ... Muslim/Bab’i conflict
Bosnia, 1992-95
Boxer Rebellion, 1899-1901
Christian Romans, 30-313 CE
Congolese Genocide (King Leopold II): 13,000,000
Croatia, 1991-92
Crusades, 1095-1291 - 6,000,000
Dutch Revolt, 1566-1609
Eighty Years' War: 1,000,000
English Civil War, 1642-46
First Sudanese Civil War: 1,000,000
French Wars of Religion: 4,000,000
Great Peasants' Revolt: 250,000
Holocaust, 1938-45
Huguenot Wars, 1562-1598
India, 1992-2002
India: Suttee & Thugs
Indo-Pakistani Partition, 1947
Iran, Islamic Republic, 1979-
Iraq War: 500,000
Iraq, Shiites, 1991-92
Islamic Terrorism Since 2000: 150,000
Jewish Diaspora (Not Including the Holocaust): 1,000,000
Jews, 1348
Jonestown, 1978
Lebanon 1860 / 1975-92 250,000
Molucca Is., 1999-
Mongolia, 1937-39
Muslim Conquests of India: 80,000,000
Nigeria, 1990s, 2000s- 1,000,000
Northern Ireland, 1974-98
Russian pogroms 1905-06 / 1917-22
Rwandan Genocide: 800,000
Second Sudanese Civil War: 2,000,000
Shang China, ca. 1300-1050 BCE
Shimabara Revolt, Japan 1637-38
Sikh uprising, India, 1984-91
Spanish Inquisition, 1478-1834 - 5,000
St. Bartholemew Massacre, 1572
Taiping Rebellion, 1850-64
The Holocaust (Jewish and Homosexual Deaths): 6,500,000
Thirty Years War, 1618-48 - 11,500,000
Tudor England
Vietnam, 1800s
Witch Hunts, 1400-1800
Xhosa, 1857