The Catechism in Questions & Answers

90. Do human beings have to remain in spiritual death?

Human beings cannot undo the condition of separation from God on their own. But even as sinners, human beings are not without the comfort and help of God. God does not leave them in spiritual death: with the incarnation of God in Jesus Christ, His sacrificial death, and resurrection, God has created the opportunity for all human beings to be delivered from spiritual death.
The first reference to the sacrifice of Christ was given to human beings when God said the following to the serpent: “And I will put enmity between you and the woman, and between your seed and her Seed; He shall bruise your head, and you shall bruise His heel” (Genesis 3: 15).