The “gene” claim is just a red herring. Something to get some people “go along to get along”.
The homosexual agenda is the battering ram for the sex positive agenda. The goal is to end ALL moral judgements over ALL sexual pairings, regardless of sex, age, relation, marital status, number, or species of partner(s). Doesn’t matter if it is “genetic” or just a whim. They believe anyone should be able to “do it” when they want, with whatever they want.
They see sex as a birthright to be enjoyed by everyone at every age without moral judgement. Smash monogamy. They oppose abstinence, not because “it doesn’t work”, but because it establishes sexual “restraint” in acting on desires. They call that “unhealthy”. They find it an obstacle to arriving at their end.
The end goal is the criminalization of Christian beliefs.
But that’s just my “Cosmic Battle” viewpoint.