Second, the etiology of homosexuality has not been found to have a biological basis.
Science is looking, believe me! Because it’s quite an issue.
I don’t think they’ll find one….from a scientific standpoint why would evolution, whose sole purpose is to pass on genes, mutate one that would defeat that purpose?
I can't remember if I already posted this here or in another thread but:
Evolution is a population study, not an individual one. There are many survival strategies in social species where not every individual breeds, where non-breeding members of the society preform other functions that lead to group health(gathering, guarding, nurturing uninterrupted so the primary breeders can carry on breeding uninterrupted). Including members who only engage in same-sex coupling, which exists in many species outside humans, from birds to primates.
Secondly, I highly doubt there is any such thing as a 'gay gene' (ditto 'pink brains for girls. Blue brains for boys') because homosexuality encompasses a dynamic series of traits and there is no instance of genes covering such broad systemic and behavioral change. Even genetics for aggressive tendency is a gene series plus a lot of other qualifying non-genetic indicators.
But genes aren't the only biological process that make up who we are. And anyone with an abnormal hormone condition could tell you how it radically effects your life and self-expression without ever being genetic. And that's just one example.
But none of that really matters either because 'nature vs nurture' is overly simplistic, creating a bright white line between the two that doesn't exist and setting up 'nature' as the preferred option when many times it is not. 'Natural' doesn't mean 'good' and 'unnatural' doesn't mean bad.
Finally, 'I can't help being what I am' has never stopped other discriminators from bigotry against those persons (eg racism, sexism, et all.) So why would we think any homophobes would be changed with biological science when that's not the reason for their homophobia in the first place?