"What therefore God has joined together, let not man separate" (Matthew 19:6, ESV).
Each morning my husband and I greet each other with a kiss. His rosy cheeks and fair skin come close to my milk chocolate tone (as my son likes to say) and curly hair. My husband is white and I am black. We don't wake up and notice the difference of our skin color; frankly, we go most of our days without a thought of it. But every so often someone else will remind us. Like the time when we were dating and we stepped out of a restaurant hand-in-hand. The black couple standing next to the car adjacent to ours wasn't amused by our public display of affection. "Sell-out," was not only the message in their looks; it came off the male's lips. And then there was the time we visited Memphis, Tennessee, and ate at a nice restaurant in a suburban area. I was most definitely the oddball, and the glares helped remind me that I wasn't welcome.
Interracial marriage may be growing in acceptance now among the general population, but it has always been acceptable to God. In Numbers 12:1-10, God severely punished Miriam and Aaron for criticizing Moses' marrying a Cushite (Ethiopian) woman. Interracial marriage isn't merely acceptable; it reflects the beauty and glory of the gospel.
When I think of the gospel, I think of reconciliation, peace, unity, acceptance, redemption, and forgiveness. At salvation, we are reconciled to God and have peace by the blood of Christ. We are united now with Christ and accepted by God fully through his grace. We are redeemed and have complete forgiveness of sins. It is amazing grace! There's an earthly union that has similar descriptions as the gospel. It falls short of redemption but displays the power of the gospel and the glory of God in the lives of Christians.