"A. Gay activists are not asking for just one homosexual marriage, even though they often personalize it by saying, 'Don’t you interfere with my family and I won’t interfere with yours.' What the activists want is a new national policy saying that no longer is a mom and a dad any better than two moms or two dads. That policy would turn some very important principles upside down:"
You haven't answered the question. Try again, please, without changing the subject.
"Marriage would become merely an emotional relationship that is flexible enough to include any grouping of loving adults."
Actually, it already is. The only real question is whether or not the participants in any given marriage are equally flexible (I am, but I'm firmly in the minority here).
"If it is fair for two men or two women to marry, why not three, or five, or 17?"
First, slippery-slope fallacy. Second, you're comparing apples and oranges, as it were. What we who support marriage equality are asking is: why is it so right for these two adults to get married (points to a man and woman) but so wrong for these two adults (points to a pair of men), or for these two adults (points to a pair of women)?
All that having been said, why not let more than 2 people marry each other? As long as they're all adults, and they're all fine with the arrangement, there should be no problem, should there? Hell, even your precious Bible condones such marriages.
The terms 'husband' and 'wife' would become merely words with no meaning."
And your point is....?
"Parenthood would consist of any number of emotionally attached people who care for kids. 'Mother' and 'father' would become only words."
And your point is....?
"Gender would become nothing. The same-sex proposition cannot tolerate the idea that any real, deep and necessary differences exist between the sexes."
Just like the marriage-euality opposition can't tolerate the idea that physical gender, gender roles, or sexuality are nowhere nearly as fixed and immutable as they say they are. Oh, but you've got your precious Bible backing you up, so that doesn't count against you, does it? *smirk*
"It must rest on a 'Mister Potato Head theory' of gender difference (same core, just interchangeable body parts)."
Clearly, this person has never seen any of the anime, nor read any of the manga, of Ghost In the Shell. This "Mr. Potato Head theorem" of interchangable bodies has been around for quite a bit longer than the recent fight for marriage equality.
"If real differences did exist, then men would need women and women would need men."
Three words, numbskull: in vitro fertilization.
"Our children would learn that sexual differences are like mere personality types. Wait until your kids start bringing those papers home from school."
Actually, I have no desire to beget any offspring. *pauses for you to gasp and grab a cross with which to try to ward me off* I'd rather wait until your kids start bringing those papers home, if only to watch your face turn as purple as Motoko Kusanagi's hair. *wicked grin*