Well, a detailed investigation of the subject reveals that your conclusion is merely a personal opinion which goes contrary to statistical reality. You see, Most of the biggest wars were non-religiously motivated.
Examples:
The 100 Years War, the 30 Years War, the Crimean War, WWI and WW2 all had nothing to do with religion. We also had the Korean War, which was fought over territorial unity and communism vs. democracy. The Persian Gulf War which was fought over oil. The present war between Russia and Ukraine is primarily motivated by the potential economic benefits. The wars that Shaka, the Zulu chief fought against neighboring tribes was not religiously motivated.
Neither were the bloody Mongolian invasions by Genhis Khan and Attila. Neither were the genocidal wars Caesar fought against the Gauls, and the Britons, nor were all the wars Rome fought to become an empire nor was the Civil War that Caesar fought against fellow Roman Rivals motivated by religion
Neither were the three Punic Wars between Rome and Carthage. Neither were the French Revolution, nor the American Revolution, nor the Napoleonic wars nor was the bloody four-year-long American Civil War fought over religion. Nor was the Spanish American War, nor the bloody Spanish Civil War.
All these were motivated by other factors, such as territorial issues, personal momentary gain or were related to political and financial considerations or political ideological differences.
So statistically, only a tiny percentage of wars were motivated primarily by religion. Is this merely my personal opinion? Not at all!
The Myth of Religion as the Cause of Most Wars
...my argument is that claims that religious wars are more violent and greater in number than other types have
no empirical evidence to support them. Such arguments are wholly anecdotal, which almost certainly explains why
professional historians have not embraced them. Available quantitative analyses of history’s wars in this regard, as flawed as they are, point in a different direction: that religious conflicts are but
a relatively modest percentage of the total and that
other causes or ideological motivations have inspired as much or more conflict than religion. Thus, until new data are collected that demonstrate otherwise, the claim that religion is the greatest cause of war is an
unsubstantiated myth.