*Yawn*
You didn't answer anything. You just reiterated the slippery slope fallacy (if gays marry next comes siblings and bestiality!) - and you think citing two random incidents of a brother and sister or a man and his horse somehow indicates some terrible trend? Huh! Did you hear that a black man killed someone in Chicago yesterday! Oh god, we need to reverse civil rights! (If a black man killed someone in Chicago, then what would stop a Mexican from killing someone in Dallas tomorrow! (same reasoning you have - total crap). And several countries have legalized same sex marriage for years - are such slippery slope atrocities occurring there? Nope, not whatsoever.
And while you're at it, show me some science from an objective scientific organization that says gay people are NOT born gay (No, Christian Family Values Council is not objective. Look and you'll find Christian groups "proving" Jesus Christ is our lord, proving all the events in the bible etc).
And Ha, are you implying AIDS came from gay people and not rural Africa? Okay, do ten seconds of research and get back to me on that one. And if your argument is "look who was the first group to bring it to the US", do you mean to say you know a gay men spread it here? And even if they were the first group to bring it here (which they were not) then did you know Cholera came here initially from Europe, Small Pox from the South Americans, Swine Flu from mexico, avian flu from asia. Do you support persecuting the Mexicans, Europeans, Africans and Asians for bringing us such terrible plagues?
Look, I'm not gonna change your mind. But you may have noticed that your perspective (being gay is wrong) has waned considerably in recent years as knowledge, science and people's personal experience with gay people has increased. I'm sure you think it's just some evil gay agenda, as if being gay is a walk in the park in a society where many people share your beliefs.
Overall, you seem intent of demeaning, insulting and oppressing a group of people whose sexual orientation has done you, nor anyone, nor themselves no harm. You are the one harming people. And to me it's mean-spirited, cruel and ignorant in the face of science and real world experience.
And there always have, and always will be people like you. Yet somehow they never realize it, even when it couldn't be more obvious.
And the funny thing is - our world population is preparing to double yet again in only a few decades and severe overpopulation and diminishing resources is an inescapable fact. Is having a group of people who cannot produce their own children but who often take the task of adopting and raising parent-less children seem at all destructive? In fact, doesn't it seem, well, perfect given our situation?
Oh god, here comes the "then why not let men marry goats" bullshit again...