20. Are all saved through Christ just as all were lost through Adam?
No. Only those are saved who by true faith are grafted into Christ and accept his blessings.
Mt 7.14; Jn 3.16,18,36; Ro 11.16-21
21. What is true faith?
True faith is not only a knowledge and conviction that everything God reveals in his Word are true; it is also a deep-rooted assurance, created in me by the Holy Spirit through the gospel, that, out of sheer grace earned for us by Christ, not only others, but I too, have had my sins forgiven, have been made forever right with God, and have been granted salvation.
Jn 17.3,17; Heb 11.1-3; Jas 2.19
Ro 4.18-21; 5.1; 10.10; Heb 4.14-16
Mt 16.15-17; Jn 3.5; Ac 16.14
Ro 1.16; 10.17; 1Co 1.21
Ro 3.21-26; Gal 2.16; Eph 2.8-10
Ro 1.17; Heb 10.10
22. What then must a Christian believe?
Everything God promises us in the gospel. That gospel is summarized for us in the articles of our Christian faith–a creed beyond doubt, and confessed throughout the world.
Mt 28.18-20; Jn 20.30-31
23. What are these articles?
I believe in God, the Father almighty, creator of heaven and earth.
I believe in Jesus Christ, his only Son, our Lord, who was conceived by the Holy Spirit and born of the virgin Mary. He suffered under Pontius Pilate, was crucified, died, and was buried; he descended to hell [sic]. The third day he rose again from the dead. He ascended to heaven and is seated at the right hand of God the Father almighty. From there he will come to judge the living and the dead.
I believe in the Holy Spirit, the holy catholic [i.e., universal] church, the communion of saints, the forgiveness of sins, the resurrection of the body, and the life everlasting. Amen.
From the Heidelberg Catechism.
See also, The Apostles’ Creed.