Is it a sin for different races to marry?

No. There is no conceivable grounds in the Bible to justify any
sort of racial prejudice or discrimination, and refusing to marry people
of other races would certainly fall into this category. James 2:8,9 lists
discrimination as a sin on par with adultery and murder. Although the
context of James 2 is economic discrimination, I believe this would apply
equally well to racial preferences. In Galatians 3:26-29, Paul states
that there is neither Jew or Greek, slave or free, male or female, slave
or free, but that all are one in Christ. Some have sought to justify
their prejudice against interracial marriage, making it sound
pseudo-spiritual by asking “what about the children?” I would answer,
“What about the example of Jesus Christ, who broke every cultural, racial
and gender taboo of his day in order to bring people together?”

In fact, I would say that it is sinful, in the church, if
different races do NOT marry. What I mean by this is that, based on
Galatians 3:26-29, if any group should be leading the way in bringing
about unity and understanding between different nationalities, cultures
and races, it certainly should be the church of Jesus Christ. It is a
very sad fact that “Christian” groups in the United States of America have
traditionally been very segregated. In fact, commentators have called
Sunday morning in US churches the most segregated hour of the week. This
is unacceptable and is a horrible example. I believe that if you come
across a true biblically-oriented church, you will also find a group which
is interracial and which honors marriage between races.

John Oakes