The gay agenda is the attempt to convince society that gay people are an oppressed victim class who need major societal and legal changes to protect them, like anti-discrimination laws, or the redefinition of marriage. They do this by recruiting young people who don't know any better to identify as some kind of LGBT, then convincing them they were "born this way". It's basically already succeeded at this point, now all there is to do now is wait for societal collapse.

I should also note that it's not actually gay people who perpetrate the gay agenda, but Marxists looking to gather an anti-west, anti-capitalist coalition including gays, Muslims, and the college-"educated" (indoctrinated). Gays are being used by the gay agenda more than anyone else.