False. Homosexuals can marry--we know, because many of them, when they decide to be homosexual, leave their wives or husbands. On the other hand, saying "this homosexual couple is a legitimate marriage now, and if you pay taxes, buy insurance, get loans, or do business in any way you have to acknowledge it as such" is an attempt to impose non-religion on someone.
Oh horrors! We're trying to impose tolerance on someone, instead of staying bound to fundamentalist dogma!