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Because God's purpose for creating a man and a woman is to procreate, populate the Earth, and take care of his creation. Procreation can only occur between a man and a woman. This is one of the few principles that's consistent between creationism and evolution. For the human race to continue to exist, we have to reproduce. If we don't reproduce, eventually we will go extinct. Survival of the fittest.

As for interracial relations, the Christian doctrine is pretty clear about the gospel being for all cultures and races. The Great Commission calls for all Christians to preach the word to the ends of the Earth. The gospel, while claiming exclusive truth, commands its followers to be inclusive-acting, as in, to love all people as yourself.