I think a large part of it comes from a fear of the unknown and the consequences of that unknown.
My Mom (who steadfastly believes I'm gay just because I can't get girlfriends) thinks that if gay marriage were legal that other things that are supposedly fundamental to society will disappear. For example she thinks that if a society can make gay marriage legal, then why not make theft legal, or murder legal? For her, and others like her, all abject morality, and laws derived from them, is not the product of a collaborative society but dictated by divine authority. For these people murder isn't wrong because it has ended a distinct human life, it's wrong because God commanded it was to be wrong. So for them because religious authority continues to state it's wrong, regardless of it's inherent irrationality, it is wrong. That it harms no one is irrelevant to them.
Now what makes this even more confusing is that these same people will often rationalize themselves around God's Will in other areas. Rationalizing theft or understanding that outlawing coveting, a thought process, itself is rather silly and impossible. But for this one, they stand their ground. To account for that one must also understand that the secondary element of this is the halcyonic view of the past that they have. Gays just didn't get married in the good-old-days and so they shouldn't now. This is the same mindset that kept women "in the kitchen" and out of the workplace for far too long.
Just my 2 cents on it.
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