Not much else.
How will we know that's true? That this battle is only an expression of their hatred? Because when they 'win' this one, they'll find some other way to degrade us - to fight us - to stomp on our beliefs... It's the 'fight' they're after - only the fight.
How many gays want the responsibilities and restrictions of a marriage? If their current lifestyle is any hint, I'd say, 'not many'. People in permanent rebellion against their 'parents' aren't going to fight to 'settle down'. It's the fight - the slamming the door and stomping out - the high drama of high school that's the real goal. The joy of being seventeen forever - with adult freedom. And the adults? We're sooooooo tired of them. Tired of the antics, tired of the crap... If they win - or when they win 0 they'll choose another fight. It won't end... Think angry rebellious teenagers - huddling with each other against the rules Mom and Dad put down... What a load.
Gays should form domestic partnerships and see how that works for them. Show the rest of us how responsible and serious they are... who knows, we could be wrong about their motives - I don't think so - but it's possible...
More generally, the left's hatred for Christian values.