You make a valid point--as far as it goes. The problem with your analysis is that there are degrees of homosexuality; otherwise, bisexuals wouldn't exist.
Some gays are 10s on a 1 to 10 scale (10 being homosexual in toto).
Some gays are 5s and 6s. And still other gays are 1s and 2s, which means they "swing" both ways. For youths who are developing their sexual identity and who haven't determined that identity or are at the low end of the 1-10 scale, the existence of married same-sex couples, together with society's acceptance of marriage equality, may influence them to become homosexuals. In effect, the example set by homosexuals can be persuasive.
I've having trouble with the logic. You seem to be using "homosexual" in two different ways in the same sentence. First, you say it's a continuum (which I don't necessarily disagree with), then at the end, you say that a person on the low end of the scale can be influenced to "become homosexual." But if they're on the low end of the scale, they're
already homosexual, because it's a continuum and they're on it.
The main change I could see is:
With social rejection of gay relationships, if a person on the low end of the scale meets a great partner who happens to be of the same sex, he/she might reject that partner and look for one of the opposite sex to avoid the social hassle.
With social acceptance, he/she would have a chance to choose that partner without fear.
I don't see a problem with that. More chance for happy couples to find each other is a good thing.
Here's what I'm not getting. If the goal of the LDS church is to prevent its members from engaging in gay sex, that's similar to all the other things it wants to prevent its members from doing: divorcing their wives/husbands, drinking alcohol, having sex outside of marriage, smoking, shopping on Sunday, scheduling individual activities on family home evenings, etc. etc.
None of those things is illegal. But none of those things is
required by law, either. So if church members don't want to do them, they don't have to. Why is marriage any different?
There are churches that require difficult things of their members, such as wearing obvious clothing that can make them targets for hate crimes like Sikhs or foregoing normal modern conveniences like the Amish, yet those churches' faithful members do what is expected of them, despite society.
If the LDS church has a viable answer for people who are gay yet who want to join the church, seems it really doesn't matter what non-members do, potential members will accept that answer if they want to be members. If they don't want to accept that answer, well, that's their problem. Legally forcing them against their will won't get them any closer to God, from the LDS view.