Original sin, also called ancestral sin, is the Christian doctrine of humanity's state of sin resulting from the fall of man, namely the sin of consuming from the tree of knowledge of good and evil, stemming from Adam's rebellion in Eden. This condition has been characterized in many ways, ranging from something as insignificant as a slight deficiency, or a tendency toward sin yet without collective guilt, referred to as a "sin nature", to something as drastic as total depravity or automatic guilt of all humans through collective guilt.