Most people say they believe some of the ideas in their religion, but often act like they don't. Extremists believe many of the ideas of their religion with ce

Most people say they believe some of the ideas in their religion, but often act like they don't. Extremists believe many of the ideas of their religion with certainty, and act in accordance which can lead to behaviour that is illogical from an outside perspective or ethically unhinged. Extremists are the ones who take their religion too seriously. You can be an extremist about other ideas too. Like a raw vegan. Arguably regular vegans too - there's no health reason to be 100% vegan vs 95% - probably the contrary.