Emunah (Faith) is not simply intellectual belief, regardless of how sincere or authentic that belief is. The Jewish understanding of emunah is steadfastness and fidelity toward God, which includes belief but is incomplete without faithful obedience to God.
God knows what we need, and He has given that to us through His Word and His Spirit, which were both given at Shavuot (Pentecost). In the season of Shavuot, God fulfills the fourth statement of redemption – that He will take the Children of Israel as a people and be God to them.