In fact, Calvinism is completely founded upon this single, fundamentally false teaching and represents a classic case of how error leads to more error, which leads to more error... . The doctrine is "Total Depravity," sometimes called "original sin" or "inherited sin." I now nothing about this doctrine, but I wonder how 'sin' is defined here? Does the author recognize both meanings (perhaps there are more) or is this just another word game, substituting one meaning for another to set up a straw man?