Funny, you mentioned God but you didn't show any Biblical proof. Mind you share it with us?
There are many warnings against the Jews mixing with other people.
Deuteronomy 7
3 Neither shalt thou make marriages with them; thy daughter thou shalt not give unto his son, nor his daughter shalt thou take unto thy son.
4 For they will turn away thy son from following me, that they may serve other gods: so will the anger of the LORD be kindled against you, and destroy thee suddenly.
Here they kill a jew/non-jew couple and God stops the plague he had sent because of it.
Numbers 25
6 And, behold, one of the children of Israel came and brought unto his brethren a Midianitish woman in the sight of Moses, and in the sight of all the congregation of the children of Israel, who were weeping before the door of the tabernacle of the congregation.
7 And when Phinehas, the son of Eleazar, the son of Aaron the priest, saw it, he rose up from among the congregation, and took a javelin in his hand;
8 And he went after the man of Israel into the tent, and thrust both of them through, the man of Israel, and the woman through her belly. So the plague was stayed from the children of Israel.
Hosea 5:7
7 They have dealt treacherously against the LORD: for they have begotten strange children: now shall a month devour them with their portions.
And "strange" in the Bible can mean "foregin".
Exodus 18:3
And her two sons; of which the name of the one was Gershom; for he said, I have been an alien in a strange land:
And here's a warning against inter-racial marriages in general as they destroy cultural/national unity and weaken them.
Hosea 7
8 Ephraim, he hath mixed himself among the people; Ephraim is a cake not turned.
9 Strangers have devoured his strength, and he knoweth it not: yea, gray hairs are here and there upon him, yet he knoweth not.