God has communicated tirelessly with humanity through men and angels. The first chapters of Hebrews displays Christ's superiority over even the angels.
Jesus Christ's priesthood is superior to the Aaronic priesthood because Christ tenure is eternal rather than temporal, guaranteeing both continuity and quality.
What we believe automatically determines what we do; it is impossible to separate faith and works. If Jesus is not our source of belief, our works will suffer.