The theological system or doctrines associated with Matthias Flacius, emphasizing historical development of Christian doctrine.
From 'Flacian' plus the suffix '-ism' indicating a system of beliefs; emerged during the Protestant Reformation debates of the 16th century.
Flacianism introduced the radical idea that original sin didn't just make people bad—it fundamentally changed human nature itself—a claim so controversial it split Protestant theologians for centuries.
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