Saying that gay rights aren't as fundamental of an issue because it's not as cut and dry today as women's suffrage and slavery are today is patently ridiculous. Those issues have had decades to pass from controversial to relatively settled to settled.
Age of an issue does not dictate importance.
That's really not what I wrote at all, though.
That's exactly what that part of your sentence says, unless I am reading this incorrectly.
X = "you believe that gay rights are as fundamental as women's suffrage"
Y = "gay rights are as decided nationwide as women's suffrage"
All I wrote is that X does not imply Y. You seen to be interpreting it, though, as (not Y) implies (not X), the contrapositive of which is X does imply Y, which is basically the opposite of what I meant.
Go to any of the thousands of rural communities in the United States, especially in the midwest, and you will find many people who will strongly stand by their opinion that gay marriage should not be legal.
Just because you believe that gay rights are as fundamental as women's suffrage does not mean that, as a political issue, gay rights are as decided nationwide as women's suffrage.