The argument over innateness is a red herring that plays into the homosexual lobby's hands. The reference point needs to be shifted from the individual, whose inner convolutions are unknowable, to society. Whereas society experiences your race as something you are, it experiences your sexuality as something you do, regardless of whether it's innate or not. And society has a right to pass laws that take into account what you do. That's what makes gay marriage not a civil rights issue.
The argument would be that what you DO is inseperable from what you ARE, that the latter dictates the former. A diabetic doesn’t CHOOSE to go into a coma; he does so because he is diabetic. He may choose to inject insulin, which may stave off the coma, but even in that case, his behavior (the injection) is a function of his nature (being diabetic). Don’t shoot me; I don’t believe any of that claptrap. I’m just playing the Devil’s advocate.
The real answer to this specious defense is that we are not opposing homosexuality or even homosexual behavior. That will be judged by the Ultimate Authority. What we oppose is the false normalization of deviancy and the insistence that society grant it its imprimatur.