Religious differences are a major cause, if not The major cause, of wars.
Wrong! The DIFFERENCES in all major matters are major cause of wars. Be it religious, cultural, economic, ethnic etc
Were WWI or WWII caused by religion? Was the US Civil War caused by religion? Was the Hundred Years War caused by religion?
How many people died from religious teachings? How many people died from WWI, WWII, and also, Cold War? Conflicts among non-religious philosophies (nationalism, communism, facism, capitalism, etc.) have killed much much much more people than conflicts caused by / among religious philosophies.