I think you are confusing the object of faith with faith. Christ and his finished work is the object of our faith but it is not faith.
Please show me where I misunderstand the following.
that to the nations the blessing of Abraham may come in Christ Jesus, that the promise of the Spirit we may receive through the faith. Gal 3:14 YLT
The promise of the Spirit is received because of the faith.
Nevertheless I tell you the truth; It is expedient for you that I go away:
for if I go not away, the Comforter will not come unto you; but if I depart, I will send him unto you. John 16:7 KJV
This was told the disciples on the night before the crucifixion the same night Jesus had sweat drops of blood in the garden.
If I am not obedient unto death even the death of the cross the Comforter/Holy Spirit will not come unto you.
In the garden. Saying, Father, if thou be willing, remove this cup from me: nevertheless not my will, but thine, be done. And being in an agony he prayed more earnestly: and his sweat was as it were great drops of blood falling down to the ground. Luke 22:42,44 And then as stated in Matthew 26:45 Then cometh he to his disciples, and saith unto them, Sleep on now, and take [your] rest: behold, the hour is at hand, and the Son of man
is betrayed into the hands of sinners.
Is this in Hebrews 5:7,8 KJV describing that moment in the garden? Who in the days of his flesh, when he had offered up prayers and supplications with strong crying and tears unto him that was able to save him from death, and was heard in that he feared; Though he were a Son, yet
learned he obedience by the things which he suffered; Did the Son of God actually have to learn obedience? Is the following the same obedience? Phil. 2:8 KJV
And being found in fashion as a man, he humbled himself, and
became obedient unto death, even the death of the cross.
Would you agree based on the above that the following is also speaking of Jesus? For consider him that endured such
contradiction of sinners against himself, (see Matt. 26:45) lest ye be wearied and faint in your minds. Ye have not yet
resisted unto blood, (see Luke 22:44)
striving against sin. Hebrews 12:3,4 KJV
Was it not his going away in death by which he became the author and finisher of the faith verse 2 of Hebrews 12?
Would it be fair to the word of God to call what Jesus went through, "obedience of faith"? Both words being nouns in both places this phrase is used?
It is because of the obedience of faith the blessings of Abraham are carried to the nations (Gentiles), paraphrase of Rom. 1:5
Is it because of the obedience of faith of Jesus that the Gentiles (nations) are fellow heirs, according to the revelation of the mystery, which was kept secret since the world began? Romans 16:25,26
That the Gentiles should be fellowheirs, and of the same body, and partakers of his promise in Christ by the gospel: Eph. 3:6 KJV