God: "I looked for someone to take a stand for me, and stand in the gap" (Ezekiel 22:30)
The motive for repentance is not only sorrow for sin but also a sense of the mercy of God in Christ. We have zero motivation to repent, unless we see the mercy of God awaiting us. Not the slap of God, but the embrace of God. Repentance is not just turning from sin, not even that primarily. Repentance is primarily turning to God, moment by moment, because He has promised His mercy to the penitent.
Assent to certain propositions about God is not all of faith in God, but it is necessary to faith in God; and Christian faith, in particular, though it is more than assent to a creed, is impossible without assent to a creed.