For Christians, this situation with homo marriage differs from abortion.
The pro-death crowd doesn't target Christians, whereas the pro-homo crowd does.
So it won't be a matter of "not doing much of anything" because Christians are facing an existential threat from the homos. Christians will react.
I disagree. The pro-death crowd are the same people who have been targeting Christians and Christian values directly for decades. See the removal of Christianity from public life since 1960 or so. I would not bet on Christians doing anything more about this than they have done about anything else. I hope I am proven wrong but I do not expect it.