Nominally or superficially Christian; professing Christian faith without practicing its deeper principles or values.
From Greek epi- (upon, over, superficially) + Christian. The prefix epi- carries a sense of being on the surface, implying shallow or surface-level adherence.
This is a genuinely harsh word—it's used by theologians to criticize people who claim to be Christian but don't live it. Medieval Christian scholars invented lots of 'epi-' words to describe false versions of faith: epichristian, epiclergy, epibishop.
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