How do we know that all humans are born with sin?

Scripture clearly affirms that all humanity is affected by sin from birth. Psalm 51:5 declares, 'Behold, I was brought forth in iniquity, and in sin did my mother conceive me,' indicating the inherited sinful nature of every person. Just as Naaman's leprosy represented a physical ailment that consumed him, our sin nature corrupts our spiritual state, leading to death unless redeemed by God. This perspective underscores the fundamental nature of sin within the context of the Christian faith.