[quote=@Andreyich]
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Both of those are wrong. Islam has Sunnis and Shiites and there are weird cults of it too (weirder than the normal variant, that is) and Ireland had Catholicism and Protestancy.
[/quote]

Kinda the point though isn't it? Europe got so Christian that people started killing one another over their flavor of Christian, and the same in the middle east with Islam (when they weren't fighting one another). Conformity gained nothing. It's really handy in a war, but not so much when trying to just exist as a country.