A little reflective commentary:
In the Old Testament bloodline was everything. If you did not belong to the Jewish bloodline, you could not fully participate in all of the covenant blessings, even as a believer in and follower of Yahweh. And within the bloodline there were tribes that further defined your potential role(s) within the covenant community. Essentially, your rights were assigned according to your DNA.
On the other hand, in the New Testament, Jesus seemingly eradicates familial lines when he says, "If anyone comes to me and does not hate his father and mother, his wife and children, his brothers and sisters—yes, even his own life—he cannot be my disciple. And anyone who does not carry his cross and follow me cannot be my disciple." (Luke 14:26-27)
What can we make of this? Did Jesus eradicate the covenant that Yahweh had with the Israelites? NO! Jesus said, "Before Abraham was born, I AM (Yahweh). (John 8:58)" He is God, He has always been God, and He does not change. The covenant promise to Abraham is fulfilled in Christ, just as Paul wrote to the Galatians in Chapter 3, verses 26-29:
"You are all sons of God through faith in Christ Jesus, for all of you who were baptized into Christ have clothed yourselves with Christ. There is neither Jew nor Greek, slave nor free, male nor female, for you are all one in Christ Jesus. If you belong to Christ, then you are Abraham's seed, and heirs according to the promise."
(Here's my point:)
If we think that our familial bloodlines are the primary building block of covenant community in the church, we have missed a very key ingredient in the whole idea of the Gospel message -- that key is ADOPTION.
The spirit of True, Biblical adoption is to treat every church member just as we would if they were our own blood relative -- actually, we should even treat each church member BETTER than a blood relative. Because the Brotherhood with Christ far exceeds our understanding of earthly relationships, transcending every station and biological pre-determinant, such as: slavery, race, age, and gender.
Here is an excerpt from Dr. Moore's article that speaks to this idea:
"We fall for all our ideological idolatries—from white supremacy to genocidal warfare and beyond—because we see our “brotherhood” only in our DNA. We engineer radical reproductive technologies that sever procreation from fatherhood and motherhood, precisely because we don’t want children so much as we want ourselves, our own genetic material living on before us. We identify more with ourselves)... than with our churches because we don’t understand the household into which we’ve come."
"... It is difficult to see before us the day when the graves of this planet are emptied, when the great assembly of Christ’s Church is gathered before the Judgment Seat. On that day, the accusing principalities and powers will probably look once more at us, ... and they may ask one more time, “So are they brothers?”
The hope of adopted children like my sons—and like me—is that the voice that once thundered over the Jordan will respond: 'They are now.' "
WE ARE NOW!