The Father, Son and Holy Spirit gave the OT Law so that everyman may know that in and of themselves they could not live holy lives... in the fulness of this time of reality God sent His Son into flesh so that God The Father, Son and Holy Spirit could show They live in Holiness- it is Who They are by Nature without end...
15 For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin.
and this sets the framework of redemption for only that which is holy may dwell with God:
we cannot live in perfection of holiness …
God could exemplified in The Son...
So in every possible way there exist only one way to get to heaven
6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me.
God's perfect love is seen at the cross where the greatest trade was ever made
34 Then said Jesus, Father, forgive them; for they know not what they do. And they parted his raiment, and cast lots.
The Son had fulfilled the law completely and when He uttered these words it was to all mankind who has been guilty of wounding God with practiced sin....
The Son gave The God head the ability to place new hearts within sinners so that they could become children of God... Through Christ alone new life was granted by His perfect life given
1 Cor 15:20-28
20 But now is Christ risen from the dead, and become the firstfruits of them that slept.
21 For since by man came death, by man came also the resurrection of the dead.
22 For as in Adam all die, even so in Christ shall all be made alive.
23 But every man in his own order: Christ the firstfruits; afterward they that are Christ's at his coming.
24 Then cometh the end, when he shall have delivered up the kingdom to God, even the Father; when he shall have put down all rule and all authority and power.
25 For he must reign, till he hath put all enemies under his feet.
26 The last enemy that shall be destroyed is death.
27 For he hath put all things under his feet. But when he saith, all things are put under him, it is manifest that he is excepted, which did put all things under him.
28 And when all things shall be subdued unto him, then shall the Son also himself be subject unto him that put all things under him, that God may be all in all.
This all was planned by God before He even started creation itself...
4 According as he hath chosen us in him before the foundation of the world, that we should be holy and without blame before him in love:
5 Having predestinated us unto the adoption of children by Jesus Christ to himself, according to the good pleasure of his will,
6 To the praise of the glory of his grace, wherein he hath made us accepted in the beloved.