John 5:45 Do not think that I will accuse you to the Father: there is one that accuses you, even Moses, in whom ye trust. 46 For had ye believed Moses, ye would have believed me; for he wrote of me. 47 But if ye believe not his writings, how shall ye believe my words?
Thus, without the writings of Moses, in which he makes the stipulation of blood-line redemption as law, the reason for Christ’s incarnation in the New Testament would be vague, for the question would be asked: “Why couldn’t He save us in His former self as a Spirit?” Thus, Moses and the other Old Testament writers show that humanity needed Divinity for redemption to be accomplished, but that Divinity also needed humanity as the vehicle by which the redemption price was to be paid.
The Old Testament affirms the Divinity of Christ, and the New Testament certifies both His divinity and humanity. Therefore, in everything pertaining to our salvation, there must of necessity be the same concurrence of divinity and humanity, Old Testament and the New Testament. By rejecting the Old Testament, several doctrines are fanned into life, which are antichrist in nature, of which we must be careful not to succumb to.
In some instances, Christ is relegated only to humanity and is never elevated to His rightful original position in The God-head. By rejecting the Old Testament, and the writings of Moses, others have removed far from their belief system, the need for obedience, for in their minds the grace of God is adequate for our salvation all by itself. Thus, the necessary concurrence between the Divine and the human is rejected in favor of the Divine alone.
Philippians 2:12 Wherefore, my beloved, as ye have always obeyed, not as in my presence only, but now much more in my absence, work out your own salvation with fear and trembling. 13 For it is God which worketh in you both to will and to do of his good pleasure.
May The Lord add His blessing to the study of His word. God bless!