Jesus died to tear down the walls of hostility that divide all people groups in order to create in himself “one new humanity” free of division.  Jesus died to fulfill God’s original dream for humans to reflect God’s loving character through love for one another. So why do we keep bringing this up? Because it’s a central reason the Son of God became a human and gave his life for us on the cross! It’s part of the doctrine of the atonement! To fail to preach and live out this doctrine is rank heresy—and it’s the heresy that allowed white Christians to establish America by slaughtering and otherwise abusing the indigenous population and by enslaving millions of Africans. This is the original sin of America, and it is proving to be the hardest sin to repent of and eradicate. In our opinion, it cannot be brought up too frequently or too strongly.
Addressing this original sin certainly causes controversy, especially among white Christians. This is not surprising, because white people tend to be deeply socialized into believing in the goodness of the system. But we don’t believe we can refrain from proclaiming this just to “keep the peace.” For this “peace” is not peaceful to our black and brown sisters and brothers, and this “peace” is not the peace that Jesus died to bring to the human race. We can no more refrain from proclaiming that Jesus died to reconcile all people groups together in love, justice and equality than we can refrain from proclaiming that Jesus died to reconcile people to God.
When Paul declared that, “in Christ, there is neither Jew or Gentile, male or female, bond or free,”  he wasn’t suggesting that we pretend that people were no longer Jewish or Gentile or male or female. He was saying that our identity in Christ should rob all these sorts of identity markers of their social significance. Within the body of Christ, being Jewish should no longer mean you are privileged over Gentiles (as most Jews of the time assumed) and being male should no longer mean you have more rights than women (as almost everyone at the time assumed). Our differences aren’t meant to be erased, what must be erased is any power hierarchy in the body of Christ. And God’s vision is that one day we will all be brought together. People from every tribe, tongue and nation will stand before God and each other in the full glory of how he has made us. 
Yet, we cannot dismantle this power hierarchy unless we first acknowledge it, which is why white Christians need to be in dialogue with their black and brown sisters and brothers about the meaning of being white and black and brown in America. For white Christians to live in love means they care about the ways in which the church as well as the broader culture continues to privilege them at the expense of their black and brown sisters and brothers. So, acknowledging the power hierarchy that privileges whites over black and brown people is not “buying into the race politics of the world”: it is rather obeying the mandate of the Gospel.