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hatred and bigotry outside of religion, it pales compared to what religion has given the world.The 20th century is evidence enough that man is capable of resorting to the worst possible barbarism without invoking deities as justification, plenty of other excuses are readily available. Going by death count, political purges in officially atheist communist nations took the cake... by far. Ethnicity was a distant second behind politics, and religion a distant third.
> Of course I consider most "-ism"s to be religions too.
Communism, solipsism, humanism, socialism, nihilism? If the majority of philosophical and political beliefs, even those with a stated opposition to religion, are now redefined to be religion, then "religious belief" is no longer a subset of "belief", and you've expanded the categorical definition of that word to be useless at anything other than proving yourself correct.