The Dangers of Spiritual Inbreeding

​In the Old Testament, God spoke to His people about not taking brides from other tribes and nations. But then the church-age came into being, after our Lord and Savior Jesus gave His life for ALL, and He has called us ALL to live in UNITY.
 
In 1 Corinthians 12, Paul the apostle spoke of the body of Christ (the church) being lame when all the parts don’t work together as directed by the Head (Christ). 
If the right leg doesn’t want to be connected to the rest of the body, we the church are going to walk around with a limp that will stand out, and the whole world we see us as lame and deformed.
If we say that a part of the body has no value, and remain isolated, if we spiritually inbreed, so-to-speak, if we only marry within the family, eventually our relatives will have webbed feet, a lower birth rate, and eventually we’ll die out.
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So if the key fundamentals of the faith are intact, if we are all connected to the Head and the same blood flows though our veins, how can we deny fellowship with the other parts of the body and truly call ourselves followers of Christ?