The reasons for WW1 are numerous but too my knolage not one of them is a religous reason and WW2 was caused by the ambitions of leaders such as hitlar
I never mentioned that WWI or II was the result of religion. I stated that more people have been killed for religious purpose than for any other reason.
At this risk of turning this into a religious debate, some example religious deaths:
The entire population of the Earth at the time of Noah, by drowning, except for eight survivors (Genesis 7:23).
Everyone in Sodom and Gomorrah, burnt or asphyxiated (Genesis 19:24,25).
Amalek and his people (Exodus 17:8-16).
3,000 Israelite men, put to the sword (Exodus 32:27,28).
14,700 Jews, of the plague (Numbers 16:44-49).
The people of Og, killed by Moses' army (Numbers 21:33-35).
24,000 people, of the plague (Numbers 25:4-9).
All Midianite males, in war, "as the Lord commanded" (Numbers 31:6-12).
The Ammonites and the Horims (Deuteronomy 2:19-22).
The Amorites, "utterly destroyed the men and the women and the little ones" (Deuteronomy 2:33-35).
The Hittites, the Girgashites, the Amorites, the Canaanites, the Perizzites, the Hivites, and the Jebusites (Deuteronomy 7:1-5).
Everyone in Jericho except one family, "utterly destroyed, both man and woman, young and old, and ox, and sheep, and ass, with the edge of the sword". (Joshua 6:20-25).
12,000 people of Ai (Joshua 8:19-29). o All the people of Makkedah, of Libnah, of Gezer, of Eglon, and of Hebron, (Joshua 10:28-37).
All the inhabitants of Goshen, "neither left they any to breathe" (Joshua 11:12-16).
The inhabitants of Hormah, Gaza, Askelon, Ekron (Judges 1:17-19).
10,000 Moabites (Judges 3:29).
600 Philistines, with a sharp stick used for driving oxen. (Judges 3:31).
All the army of Sisera (Judges 4:16).
120,000 Midianites (Judges 8:10).
1,000 Philistines, killed by Samson with "the jawbone of an ass"(Judges 15:15).
25,100 Benjaminites, killed by Israelites after "the Lord smote Benjamin" in front of them. (Judges 20:35).
50,070 people from Bethshemesh, "because they had looked into the ark of the Lord" (1 Samuel 6:19).
All the Amalekites (1 Samuel 15:3-7).
200 Philistine men, so that their foreskins could be the dowry given to King Saul so that his daughter could marry David. (1 Samuel 18:27).
22,000 Syrians, killed by David (2 Samuel 8:2-5).
40,000 Syrians, killed by David (2 Samuel 10:18).
The Ammonites of Rabbah, tortured to death by King David (2 Samuel 12:29-31).
Every man in Edom (1 Kings 11:15).
All the prophets of Baal (1 Kings 18:40).
100,000 Syrians (1 Kings 20:28,29).
Moabite captains, burnt to death (2 Kings 1:9-14).
42 children, mauled by bears (2 Kings 2:23,24).
185,000 Assyrians, killed in the night by "the angel of the Lord" (2 Kings 19:35).
500,000 men of Israel, "with a great slaughter" (2 Chronicles 13:16-20).
20,000 Edomites, half of whom were thrown from the top of a cliff "that they were all broken in pieces" (2 Chronicles 25:11,12).
120,000 Judeans (2 Chronicles 28:5,6).
75,000 people (Esther 9:15,16).
The Crusades
Spanish Inquisition
IRA
Religious conflicts in Ireland
9/11
Etc, etc.