Ephesians 5:30
For we are members of his body, of his flesh, and of his bones.
From the creation of Adam up to the scattering of the nations at Babel, all were members of that particular group. There were families or sub-divisions, but none had the preeminence. There were 70 of these nations, as you will find in Genesis 10:1-32. But these were given up as recorded in Romans 1:18-32 and Genesis 11:9, where they were scattered abroad.
But there arose at that time, probably the very year that the tongues were twisted, a man chosen to be the head of a new nation which would be a blessing someday to the nations who were given up at that time. That was Abram of Ur of the Chaldees. This blessing was transmitted through Isaac, Jacob, the twelve patriarchs, and finally, Christ, the son of David (of the tribe of Judah). So then, those who were children of these patriarchs were members of God's chosen people, Israel. It was a blood relationship, not political. But finally, at the end of Acts, Israel, the wife, was divorced. And then began a long period of time when no nations were blessed through the only channel, Abraham, Isaac, and Jacob.
So, at the present time, God is not working in any way with a nation or the nations. He has no earthly purpose. His family today consists of those who have been accepted in the Beloved, adopted as sons, and members of The Church, which is The Body of Christ. The purpose today had been a secret or mystery hidden for ages and generations until revealed by the apostle Paul. And instead of blessings here on the earth, it has to do with blessings in The Heavenly Places. So then, instead of there being an earth program today, it is entirely concerned with The Heavenly Places.
There is nothing to do to become a member except to believe the record. In other words, it takes faith. And since the program is on the basis of grace and not of worth, it is a grace by faith salvation as it says in Ephesians 2:8-10, For by grace are ye saved through faith; and that not of yourselves: it is the gift of God: not of works, lest any man should boast. For we are His workmanship, created in Christ Jesus unto good works, which God hath before ordained that we should walk in them.
Do not mix this with an earthly calling, which has nothing to do with Heavenly Places but with life on earth. Resurrection as a result of this life is not described or even mentioned. There is no group or nation to join. No membership. But there is no bar to anyone accepting The Truth of The Dispensation of The Mystery and becoming a member of The Church, which is His Body. And, of course, many over the years have done that very thing. In fact, it is not very likely that many will be members of The Church except via the message of Life in John's Gospel. But we leave the decision on this point up to you. Our main concern is, Are you a member of The Body?
