Short reply cause Im doing homework.
Sorry, I probably shouldn't have attributed it directly to christianity. But it is still a religeous institution, and should not be redefined.
And relating this to the beating of one's wife is extreme. Obviously inflicting physical harm warrents legislative restriction.
However, with unions between gay couples, marriage is not the only thing out there. Marriage has prerequisites: in this case having a man and a woman. Gay couples just don't meet that, and to deny them the union of marriage because they don't meet that is not an infringement of their rights. Like the example of Boy and Girl Scouts. A boy cannot join girl scouts, because he is not a girl, thus he doesn't meet the requirements. Same with vice versa. This restriction is not infriging on anyone's rights.
It's possible to have another union, that straight couples don't meet the prerequisites, but legally, the standing will be the same. Gays can get their equal union, while leaving the definition of marriage alone.
If two gay people want to be together, fine, go for it. I can't stop them. Just leave the definition of marriage alone.