If you don't want to live under Sharia law, don't try to impose your understanding of "Biblical" law on anyone else.
The governmental version of marriage and ours are NOT inextricably intertwined.
Jesus came to establish a kingdom transcending human government. Why are you trying to make them the same thing? Jesus explicitly rejected every attempt to force him into that role. What makes you think he changed his mind?
Give up that yoke. It's killing you and causing more collateral damage than you can imagine.