If the Bible is the word of God as many believe, then it should be very clear that God is a segregationist. God created diversity in the human population and anyone who favors destroying it through race mixing is acting against the wishes of God. Dr. Peter S. Ruckman has written about this in Segregation or Integration, What Saith the Scriptures?
I found numerous passages in the Bible relating to the separation of peoples. Below are a few.
10:5 Of these were the isles of the nations divided in their lands, everyone after his language, after their families, in their nations.
10:32 These are the families of the sons of Noah, after their generations, in their nations. Of these were the nations divided in the earth after the flood.
11:6 And the LORD said, Behold, the people is one, and they have all one language; and this they begin to do: and now nothing will be restrained from them, which they have imagined to do.
11:7 Come, let's go down, and there confuse their language, that they may not understand one another's speech."
11:8 So Yahweh scattered them abroad from there on the surface of all the earth. They stopped building the city.
11:9 Therefore the name of it was called Babel, because Yahweh confused the language of all the earth, there. From there, Yahweh scattered them abroad on the surface of all the earth.
32:8 When the most High divided to the nations their inheritance, when he separated the sons of Adam, he set the bounds of the people according to the number of the children of Israel.
32:21 They have moved me to jealousy with that which is not God; They have provoked me to anger with their vanities: I will move them to jealousy with those who are not a people; I will provoke them to anger with a foolish nation.
10:10 Ezra the priest stood up, and said to them, You have trespassed, and have married foreign women, to increase the guilt of Israel.
10:11 Now therefore make confession to Yahweh, the God of your fathers, and do his pleasure; and separate yourselves from the peoples of the land, and from the foreign women.
6:17 Wherefore come out from among them, and be ye separate, saith the Lord, and touch not the unclean thing; and I will receive you,