Q. 19. How do you come to know this?
A. The holy gospel tells me. God himself began to reveal the gospel already in Paradise; later he proclaimed it by the holy patriarchs and prophets, and portrayed it by the sacrifices and other ceremonies of the law; finally, he fulfilled it through his own dear Son.

Gen. 3:15
Gen. 22:18; 49:10
Isa. 53; Jer. 23:5-6; Mic. 7:18-20; Acts 10:43; Heb. 1:1-2
Lev. 1-7; John 5:46; Heb. 10:1-10
Rom. 10:4; Gal. 4:4-5; Col. 2:17

Q. 20 Are all saved through Christ just as all were lost through Adam?
A. No. Only those are saved who by true faith are grafted into Christ and accepts all his blessings.
Matt. 7:14; John 3:16, 18, 36; ROM. 11:16-21