According to the theology of the Christian Congregation of Jehovah's Witnesses, all humans are born sinners, because of inheriting sin, corruption, and death from Adam.

Where does sin come from?

Traditionally, the origin has been ascribed to the sin of the first man, Adam, who disobeyed God in eating the forbidden fruit (of knowledge of good and evil) and, in consequence, transmitted his sin and guilt by heredity to his descendants. The doctrine has its basis in the Bible.

What is the nature of sin?

Sin is an immoral act considered to be a transgression of divine law. ... Other Christian scholars understand sin to be fundamentally relational—a loss of love for the Christian God and an elevation of self-love ("concupiscence", in this sense), as was later propounded by Augustine in his debate with the Pelagians.