Bolshevik hatred of Christianity
(I have no idea, but here’s a copy paste of some comments for future reference / research.)
Deuteronomy 7: 3 Nor shall you make marriages with them. You shall not give your daughters to their son, nor take their daughter for your son.
Versus like this are also found in Exodus 34:15, Joshua 23:12-13., 1 King 11:2. Ezra 9:2 amongst others.
In addition, interracial marriages were characterized as a curse by God. Deuteronomy 28: 32 amogst other versus.