"I've noticed the snowball effect too - more like an avalanche actually."
Excellent! It's about freakin' time!
"This idea arose from nothing..."
No, you retard, it didn't. It came from observing that one a person in one group could legally marry who they want, while a person in a different group could not, and recognizing this as the social injustice that it is. Also, from a purely logical perspective, what you said makes absolutely no sense. Please reacquaint yourself with reality as soon as possible.
"...and is about to take over the culture."
You say that like it's a bad thing. But seriously, the entirety of human history, from the point in time at which our ancestors branched off from the taxon that would evolve into chimpanzees and bonobos, all the way through millions of years to the present, has involved ideas "taking over" a culture. That's called growth and development, and it happens regardless of whether or not you like it. Are you glad that you don't live in ancient Rome where, as a Christian, you most likely would have been persecuted and eventually killed? Do you like being able to vote your head of government into office? Do you like being able to spew such shit from your mouth and not have to fear being arrested and jailed (or worse) for it? Then you should be thankful that ideas "take over" a culture, because otherwise you would have none of the freedoms you enjoy so much today that you take them entirely for granted.
"The thing is, every time the Christians, or the Republicans, cave on a social issue, the Left comes up with another social issue to beat us over the head."
No, you are the ones who turn everything into a social issue, by dragging your feet in the mud and throwing a hissy-fit every time a new idea for improving society comes up. Millions of years of cultural growth and development, and you people have had to be dragged along kicking and screaming the entire time. The issue of gay marriage won't be any different.
"They're not interested in rights so much as in hurting us."
Oh get over yourselves already. Everything isn't about you. The rest of the world actually has better things to do than purposefully go out of its way to cause anguish to a bunch of regressives who are still a century behind everyone else. Grow up.