Earlier I mentioned a woman having intercourse with a man not of her genetic background has microchimeric consequences that may be deleterious and harmful to the health of the mother and baby. This may not be readily evident, but instead reveals itself later on physically and/or psychologically. As genotypes become more divergent...

I'm not buying that. The genotypes would become LESS divergent.

Furthermore, many people are already mixed. So, who determines where the cutoff lies?

I will agree that some groups are simply incompatible. That will vary group by group.

Generally, we just don't find those people attractive.

It's best if people decide for themselves, and not be swayed by propaganda.

Finally, I do not recall the Bible saying anything about different races not mixing; it does, however, strongly warn against marrying into groups with different religions.

In today's terms, that boils down to not marrying anyone with incompatible values.

I fully agree with that.