I guess I'm more confused as to what their objection is... that biblegod supposedly hates gays or is it the slippery slope concern?
I see the legal arguments and the "bible" arguments as almost completely different, since you will never be able to square the two. On one hand you have archaic laws/sayings/commands that haven't evolved based on knowledge/experience/practicality since some goat herder wrote them down (I know they changed in transaltion over time but essenitally still the ramblings of primitives). On the legal side, there's no absolute really for the issue - it evolves over time.
Ask me a year ago when I was still in fundie-land lite, and I would have sided with biblegod, just cuz he sez so.... Now, since I've awoken from that looong fog - I wonder what the big deal is - why is it my business?