If you broaden the definition of "religion" to mean anything prized above all else (Idolatry, to anyone who doesn't prize Jehovah above all else.) you can see that all people are religious. Somehow people don't equate their own passionate worship of things or ideas as being a religion. I've always figured there are as many religions in the world as there are people.
If your particular religion is your '55 Chevy no one else will see it as a religion, even though it is, and no one is gonna start saving up for guns and ammo to help you preserve it.
So, the only definitions of religion that people identify are what are the typical worlds religions, islam, Buddhism, Shinto, Christianity, Hinduism etc. But a strong belief in a philosophy can be a religion as well (In the sense of being a consuming passion), while the fact that it's not so identified means it will not be included in the stupid "Religions cause wars" B.S.
The causes of most wars are based on two things, power and money (The same things in different forms, like water and ice.) and "religion" is just an excuse. One could exempt islam from my broader basic reason for war, but that wouldn't be true, as islam is by far the most political (Power) religion of all. Even in islam the "religious" aspect is just an excuse for the acquisition of power.
We all band together with those who agree with us on what we prize above all else, and wars cannot happen without people banding together. By my broad definition even atheists are religious (

) and certainly that religion has resulted in more murders by far than any other. Estimates run higher than 50 million people killed by their own communist governments! (The 50 million figure is probably a minimum.) The "Black Book of Communism" puts the number at 100 million!
Then when you add wars directly or indirectly caused by communism the death toll rises precipitously.
But, of course, facts will never stop people from making silly statements to the effect that "religion has caused the most deaths".
Usually the people who make statements like that specify (In their own minds at least) Christianity, which is really off the mark statistically. Plus of course, the argument can be made that a "christian" who murders is not a true Christian at all, thus Christianity could only be used as an excuse for war to those who are not true Christians.
I find the rabid assertions of atheist's that religion causes the most wars to be amusing, since atheism is one of the tenants of communism.
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