Considering sodomy, which any homosexual sexual contact is, was against the law in many states until recently, homosexual unions weren't "law abiding". That's not a Christian thing either, that's plain old common sense, sodomy type laws were pretty common worldwide regardless of religion. So that's just BS.

Another thing that was worldwide is that man-woman was the basis of marriage. The reason is obvious why and I hope I don't have to explain.

The laws in this country that you say forbade blacks from marrying whites were actually written to forbid whites from marrying outside their own race. Never mind it was the invading white race that brought the black people here in the first place. It's not like the U.S. was a tourist destination for black people to come and snatch up a little white hottie and take her back to Africa.

And of course we know restrictions on voting here in the U.S. wasn't limited to black people. No one could vote but white men.
IMHO not allowing black people to vote pales in comparison to slavery. But that's just me.

Homosexual "marriage" is a sham. There is no natural reason for a homosexual union to be called a "marriage". The sex is has no purpose or reason and the union is sterile. There simply is no biologic need for it. Should it be illegal to be "gay"? Nope. But they in no shape or form should be allowed to call the union a "marriage".