If anyone asserts that this sin of Adam…is taken away either by the forces of human nature or by a remedy other than the merit of the one mediator, our Lord Jesus Christ, who has reconciled us to God in his own blood, made unto us justice, sanctification and redemption…let him be anathema; for there is no other name under heaven given to men, whereby we must be saved (Council of Trent, Session Five, Canon Three)
The fundamental truth at the heart of every single religion states: there is a problem with human existence. The word “religion” means “to bind together again.” Religion is a force of natural law inclination wherein all men seek to solve the problem of human existence (cf. Summa Theologica, II-II q85 a1). Each religion defines this problem differently, and thus provides different solutions.
Christianity asserts that the problem is the sin of Adam, that is, Original Sin. This means that every person born of Adam is born into sin, and bondage to him who has “the empire of death, that is to say the devil” (Heb. 2:14). By the sin of Adam, man is born with a weakened will, darkened intellect and an inclination to sin. This is why the Council of Trent anathematizes those who say that man can be saved “by the forces of human nature” since the problem is in human nature itself.