So far your interpretations leads to innumerable contradictions and turn much of Scripture into some kind of major accident, instead of a divine plan.
WRONG! He plainly separates people based on lineage, not belief. Further, the product of those marriages had to stay behind, which wouldn't be the case if mere belief was the issue! Why can't you just admit you are incorrect? Why are you unable to see simple things? Is it so hard to understand that the HOLY BIBLE WAS NOT WRITTEN WITH POST 1965 AMERICAN RACIAL AND SEXUAL ETHICS IN MIND?
This is the first and only argument you make that isn't 100% wrong. What you fail to grasp is that belief and religion are not the only differences between people, and that Galatians 3:2 is a heavenly allegory, not an apologia for everyone to gratify their lust with everyone else.
You are tragically incorrect. "Believers" have fought and killed each other for centuries. Who can judge between them? If Catholics and Protestant kill each other, who will God decide is right? The Christian church is filled with false teachers, especially now in the age of confusion! What you believe is worse than wrong, because it contradicts what had always been believed, everywhere, before the "Civil Rights" movement taught us that seeing your White daughter be given to a Black is somehow the gestalt of Christianity and human civilization. You probably think everyone who lived before then was a horrible sinner because they wouldn't approve of such marriages.
You are the one who has twisted scriptures by forcing an alien, modernist reading to them that NO ONE HAS EVER GOTTEN FROM THEM BEFORE NOW. Doesn't it concern you in the slightest that the people who "blazed trails" in the anti-racist movement were all non-Christians and perverts? Hirschfeld, Freud, Trotsky, up to modern-day pornographers (Hugh Hefner comes to mind) who were pretty much leaders in the civil rights movement?
If your belief is of God, why wasn't it discovered by the people of God? Why was it instituted literally MILLENNIA after the fact by people who hate Jesus Christ?
I can give admonitions from the Bible against marrying people from alien races. Based on your previous comments, I don't think it would matter much to you, but for those who are not drunk on racial hatred, and feel naturally inclined to marry within their own race, here is some support!
The command of Abraham to get a wife for Isaac from his father's people: Genesis 24
Tobit's command in Tobit 4:12-13
The previous verses mentioned above, warning people against seeking spouses from alien nations.
If "belief" were the only constrainer against marriage, there is no reason why the Hebrews could not have simply proselytized the surrounding nations and intermarried with them, something God never encouraged. I wonder why?
Furthermore, the Hebrew temple had a "court of the Gentiles", beyond which, non-Hebrews were not permitted to go REGARDLESS OF BELIEF. If your interpretation were correct, there would be no such court! Even worse, God restricted priestly duties to LEVITES, which has nothing to do with belief, since a Levite is not only different from a Welshman or Chinese or Kenyan, he's different from a believing Jew or believing Asherite! Didn't God know race is meaningless? Why didn't he consult with you or arch-pervert Magnus Hirschfeld, inventor of the concept of "racism"?