Gadget.
A simple question to ask yourself is do you want the elders in the congregation running your life and your marriage? You might ask your girlfriend that. If she says yes, it's already over. If she thinks about it and says no, you might have a fighting chance. Either way it looks like you have already come to a well thought out and logical conclusion. Now all you have to do is make that compulsion, a decision. It's tough to do, but not near as tough as it would be living a lie in a new marriage.
I agree with the others who say show her this board. That is bound to send her one way or the other. You don't have anything to loose that you don't have already. Either way there is going to be some pain and regrets on both sides. Life is full of them, all we can do is try to keep them at a minimum.
Dave