Penis Circumcision as Biblical Mark of Cain The idea that “the mark of Cain” refers to a circumcised penis is not a mainstream interpretation, but it has been suggested in esoteric, psychoanalytic, and anti-circumcision critiques of religion and ritual. Canonical Biblical Account: In Genesis 4:15, after Cain kills Abel, God puts a “mark” on Cain: … Continue reading Penis Circumcision as Biblical Mark of Cain