No! No! No! First off, there isn't anything that separates the genders, therefore the belief that the child would be imbalanced is terrible. Genders are not defined by their stereotypes.
Second, please keep your religious opinions out of debates, they dominate all of your thinking. What other reason is there to be against gay marriage? You think it's gross? Is that it? I think it's gross that you believe your God thinks it's just to want to bash other people for being born the way the were. Then again, I'M NOT TRYING TO TAKE AWAY YOUR BIBLES.
By the way, I'm not usually this rude, but there's an exception for people who think this way