A. The Scriptures principally teach, what man is to believe concerning God, and what duty God requires of man.
The section covering this question in Dr. Morecraft's Authentic Christianity is rather brief.
To put it concisely: an orthodox faith and an obedient life is the whole duty of man. (p. 204)
Of belief (or faith), Dr. Morecraft instructs us:
We are to believe whatever the Bible sets forth as true, and we are to believe nothing in point of faith but what the Bible teaches (Isa. 8:20), because it is the only book in the world of divine authority, and therefore the only book in the world
that is infallible in what it teaches about God. (p. 205)
It tells us what we OUGHT to do, what God wants us to do, what we are under a divine obligation to do. The Bible tells us what duty God requires of man. (p. 205)
Faith in God is the foundation of obedience to God. The things to be believed are set before the things to be practiced: “This is a trustworthy statement...that those who have believed God will be careful to engage in good deeds” (Titus 3:8). (p. 206)