You are confused about the use of the term "Body of Christ" to refer to the Church. In the Church, we are united to Christ, especially by partaking of his Body and Blood in communion. That is why the Church is called "Body of Christ". Christ of course is the head of the Church. But Jesus Christ remains one person.
12For as the body is one, and hath many members, and all the members of that one body, being many, are one body:
so also is Christ.
The HEAD/Jesus cannot say to the feet/us I have no need of you.
Without us Christ is not complete, thus the whole world is still in travail.
We read in Acts 9:3-6
3 And as he journeyed, he came near Damascus: and suddenly there shined round about him a light from heaven: 4 And he fell to the earth, and heard a voice saying unto him,
Saul, Saul, why persecutest thou me? 5 And he said, Who art thou, Lord? And the Lord said, I am Jesus whom thou persecutest: it is hard for thee to kick against the pricks. 6 And he trembling and astonished said, Lord, what wilt thou have me to do? And the Lord said unto him, Arise, and go into the city, and it shall be told thee what thou must do.
Paul was persecuting the body of Christ, yet the Lord said to Paul why persecutest thou
ME.
Until the whole body of Christ is crucified there still remains prophesy concerning Christ yet unfulfilled.
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Colossians 1:24
24 Who now rejoice in my sufferings for you, and fill up that which is behind/lacking of the afflictions of Christ in my flesh for his body’s sake, which is the church:
There was nothing lacking in Jesus afflictions He paid the full price correct?
Christ is not just the HEAD/JESUS but a many membered body, all prophesy concerning Christ must also be concerning the body and not just the head.
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Genesis 3:15
15 And I will put enmity between thee and the woman, and between thy seed and her seed; it shall bruise thy head, and
thou shalt bruise his heel.
Romans 16:19-20
19 For your obedience is come abroad unto all men. I am glad therefore on your behalf: but yet I would have you wise unto that which is good, and simple concerning evil. 20 And the God of peace
shall bruise Satan under your feet shortly. The grace of our Lord Jesus Christ be with you. Amen.
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Hebrews 2:8-9
8
Thou hast put all things in subjection under his feet. For in that he put all in subjection under him, he left nothing that is not put under him. But now we see not yet all things put under him. 9 But we see Jesus, who was made a little lower than the angels for the suffering of death, crowned with glory and honour; that he by the grace of God should taste death for every man.
Why do we not see all things put in subjection to Christ?
Because we are the FEET and all things will not be put under subjection until the FEET are made manifest to the world.
But what do we see? We see Jesus the HEAD of the BODY of CHRIST.
Those scriptures do not pertains to Jesus Christ ALONE but to EVERY member of the BODY of CHRIST.
Until the FEET are formed the subjection of all things CANNOT take place.
Thus this prophesy in Gen.3:15 will not be completed until the manifestation of the feet company.
Not so. God grants us eternal life by his grace.
While you might not believe it but Jesus says
And this is life eternal, that they might know thee the only true God, and Jesus Christ, whom thou hast sent.
Yes, and the best way to know him is to enter into his Church, instead of just trying to cobble together your own understanding from what you read.
I take it you are referring to the RCC. Sorry but that ain't the church.
The best way to know God the Father is to listen to the HEAD/Jesus because all others only see God the Father through a glass darkly.