[concerned about politics]

It's just another dysfunctional sex fetish, like bestiality/pedophilia/incest. Allowing homosexuality without allowing the rest would be discrimination based on sexual fetish/orientation.
They're all equal fetishes. None has the right to claim a higher moral ground than another.

The question here is : do we want the world to become one huge sex orgy with anything or anyone? Or do we want strong marriages and protected children to aid the survival of the human species?

Religion has little to do with it. Death/disease/abuse affect everyone. Homosexuality/bestiality/incest/plague are dangerous to the human race as a whole.