The sidetracks have gotten a bit absurd. The issues of leaf burning and slavery vs imposition of religious beliefs or theocracy. One set of behaiviors is not covered by the First Amendment. The practice of religion (or not) is. The theocracy issue is purely hypothetical, thankfully. We live in a plural democracy, so no one gets to impose their religion on somone else. If that were not the case, there would be no Catholics in this country. The protestants who established most of the colonies would have refused them entry or executed them outright.
Now, any religious group can attempt to advance their agenda through voting/lobbying like the rest of us, but that’s a moot issue for both theocracy and gay marriage. I would venture to say 99% of American Catholics have no interest in theocracy of any kind and a majority of them are supportive to varying degrees of gay marriage or at least civil unions. With the possible exception of abortion, Catholics and Christians generally have no unified agenda, and in any case, Christians will be a minority in this country by mid-century. Much sooner than that, within a decade or so, gay marriage will have enough support to pass.
It is also absurd to characterize the debate over gay marriage as one about sex. The supreme court has already ruled that “sodomy” between consenting adults is not the state’s business. Fighting gay marriage isn’t going to change that. “Ex-gay” ministry isn’t going to change that, and neither is fantasizing about a Catholic theocracy. Gay people aren’t going away, they’re not going to be “cured” and they’re not going to resign themselves to living like they did in 1960. The only real question in play is whether they will be allowed a modicum of dignity to carry out the 99% of daily life which doesn’t involves sex, like having hospital access to visit someone you’ve spent your whole adult life with.
As to the core topic of ex-gay “therapy”, I don’t know what else to say. It’s available, but then so are the third-world clinics which claim to cure cancer with secret herbal formulations and injections of colored water. Both are about on the same scientific footing.
If you’re Catholic and gay and want to live a celibate life, go for it. If your pattern of sexual behavior is driven by abuse or some other problem, go to a real psychologist, not these wing nuts. They may be able to manipulate gay people into unhappily leading outwardly hetero lives. They almost certainly put people into positions where their sex lives are more disordered and secretive than ever before, as is true with most leaders of the movement. There is no evidence that they ever took someone who was truly homosexual and “re-oriented” them.