One Mediator between God and man

After dedication of God's temple, king Solomon, summarized, that, all those who pray in the direction of Jehovah's 'house', should be considered by the ONLY Living and True God.
This temple was a REPRESENTATION of God's 'House' in the "heaven of heavens", and the "most holy" was considered as in God's presence.
Only, the high priest, was to enter the, most holy. Sacrifices would be offered to God, first on behalf of the priest[s], then on behalf of the people, for forgiveness of sins.

Jesus, after being put to death in the flesh, as a perfect man, was resurrected as an Immortal Spirit, and when He ascended, went into the very presence of God [equivalent to the most holy, or, holy of holies, on earth], to present the VALUE of His sacrifice to God.
Because, Christ's sacrifice has PAID the PRICE ONCE and for ALL TIME, there NO LONGER is any need for animal sacrifices.
Since Christ is High Priest FOREVER [He being immortal], He is in effect the Mediator, between, sinful man, and God Almighty.

In the time of Adam, God Almighty, JEHOVAH, spoke to perfect Adam, who was aware that he along with all else came into existence, BECAUSE of God. Evidently, man was to remain mortal, since, the test of obedience, had DEATH or NON-EXISTENCE as its penalty.
As a result of a rebel spirit who made himself a Resister or Adversary [Satan], this penalty was served on Adam [and by extension ALL of mankind]. But, Jehovah, stated a way out as early as Genesis 3:15, and God has progressively revealed through prophets and faithful angels, UPDATES as regards God's means of achieving a RECONCILIATION of ALL things to Himself.
Since the Chief Agent of Salvation of obedient members of MANKIND has CONQUERED, i.e. God's Word, was SENT as a perfect human [equivalent to the COST of disobedience a PERFECT life (Adam, as family head 1 Corinthians 11:3)].

Now, with the convening of the Mosaic covenant, Moses, served as the mediator, a priestly class was assigned, to carry out the function of mediators with JEHOVAH, offering sacrifices first for themselves, then for the people, for FORGIVENESS of sins.
However, Jesus the Christ [anointed One], the Son of God, was not only a Prophet like Moses [Deuteronomy 18:18-19; Acts 3:22, 23], and Mediator of a New Covenent [Jeremiah 31:31- 34; Hebrews 10:1- 18], BUT, also High Priest forever [Psalm 110:4; Hebrews 6:20; 8:1, 2].
So, we approach God, through, Jesus, as High Priest, forever, He being put to death, as an obedient faithful PERFECT man, BUT, being raised as an IMMORTAL Spirit [1 Corinthians 15:45 to 57].

Therefore, God, does not need to correspond with sinful mankind DIRECTLY anymore since God's MEANS of SALVATION has ACCOMPLISHED His earthly assignment with SUCCESS.

There is NOW, one Mediator between God and man, and this is Jesus, the Christ, the Son of God. By obeying Christ, we obey the God and Father of Jesus. 1 Cor. 11:3; John 3:16- end.

Note please, why Daniel prayed in the direction of the temple, while in Babylonian exile.

2 Chronicles 6:18 to 20.

18 “But will God truly dwell with mankind upon the earth? Look! Heaven, yes, the heaven of the heavens themselves, cannot contain you; how much less, then, this house that I have built? 19 And you must turn toward the prayer of your servant and to his request for favor, O Jehovah my God, by listening to the entreating cry and to the prayer with which your servant is praying before you, 20 that your eyes may prove to be opened toward this house day and night, toward the place where you said you would put your name, by listening to the prayer with which your servant prays toward this place.

Notice please, the Christ.

Hebrews 10:21 - 23

 21 and since we have a great priest over the house of God, 22 let us approach with true hearts in the full assurance of faith, having had our hearts sprinkled from a wicked conscience and our bodies bathed with clean water. 23 Let us hold fast the public declaration of our hope without wavering, for he is faithful that promised