Almost true. But that is not the case here because the liberals have used the law to further moral decline. In fact, the OP is a matter of law. Most of the country doesn't want gay marriage - the laws on the books in a few states are being forced down the throats of the rest by way of reciprocity.
Probably still true. If you mean would a referendum pass in most states.
However, 10 years ago such a referendum would have been defeated by 75%+. Today by 51%. Five years from now it would probably pass in most states.
The turnaround on this issue is the fastest I've ever seen. What I'm talking about is the trend , not necessarily the present snapshot in time. When the trend is that you are rapidly losing support, and there is good evidence that trend is increasing, not slowing down, then your cause is toast.
What this shows to me is that the majority of those opposed were opposed because they were going along with what they saw as "normal." Now that "normal" has been redefined to the opposite, they're equally happy to go along with that.