4 There is one body, and one Spirit, even as ye are called in one hope of your calling;
The body of Christ is the physical church, composed of one group of people, those who have trusted in the Lord Jesus Christ, the visible image of the invisible God, as their Saviour. Chapter three, verse 15, lets us know that the family of God is in heaven and earth, those who are here and those who have gone on.
Unity is again implied here. There isn’t a Baptist church and there aren’t Protestant churches, a Roman Catholic Church, or a Greek Orthodox Church. There is only one church consisting of all those people who are trusting in Christ’s righteousness and not their own to obtain eternal life. This church consists of men and women everywhere who believe in Christ’s resurrection and what He said about Himself.
Jesus Himself said;
John 14:6 Jesus saith unto him, I am the way, the truth, and the life: no man cometh unto the Father, but by me…..9 Jesus saith unto him, Have I been so long time with you, and yet hast thou not known me, Philip? he that hath seen me hath seen the Father; and how sayest thou then, Shew us the Father?
John 10:30 I and my Father are one.
Acts 4:12 Neither is there salvation in any other: for there is none other name under heaven given among men, whereby we must be saved.
Paul told the Philippian jailer;
Acts 16:31 And they said, Believe on the Lord Jesus Christ, and thou shalt be saved, and thy house.
Paul told the Romans;
Romans 10:9 That if thou shalt confess with thy mouth the Lord Jesus, and shalt believe in thine heart that God hath raised him from the dead, thou shalt be saved.
(Note: confess or swear to God – Isaiah 45:23; Romans 14:11
Isaiah 45:23 I have sworn by myself, the word is gone out of my mouth in righteousness, and shall not return, That unto me every knee shall bow, every tongue shall swear.
Romans 14:11 For it is written, As I live, saith the Lord, every knee shall bow to me, and every tongue shall confess to God.)
Or as John wrote;
1John 5:20 And we know that the Son of God is come, and hath given us an understanding, that we may know him that is true, and we are in him that is true, even in his Son Jesus Christ. This is the true God, and eternal life.
Finally, in reference to Jesus Christ, here is something else that John informed us of;
John 1:1 ¶ In the beginning was the Word, and the Word was with God, and the Word was God.
There is one Spirit that confirms and teaches us these things. There is one hope in your calling and that is eternal life with your Creator.
The simple fact is if you do not believe in a supernatural resurrection; the bodily physical resurrection of Christ, that He is, indeed, God in the flesh, and trust in His righteousness and not your own to be saved, then you are not a Christian and not a member of this one body.