Again, lots and lots of nothing.
The Pope imposed his definition of marriage on people, unless you are saying that when the Pope had power over people that he let them make their own definitions of marriage.
In your world, Islam and gays and atheists, and anyone and everyone defines legal marriage.
You yourself can claim anything you want to, but it doesn’t mean that it carries weight when you are in the military, or when you divorce and have assets and children, or when you travel between states, or all the other things that require a shared definition of “marriage”.
“In your world, Islam and gays and atheists, and anyone and everyone defines legal marriage.”
That sounds like your world to me. Gays, atheists, Muslims, and anyone and everyone can vote to determine how the state recognizes marriage right now, that’s how the state comes up with its definition. To the state, marriage is simply whatever judges, pols, or the voting public decide it is at any one time. Sometimes it coincides with the actual definition, sometimes they come up with impossibilities like ‘gay marriage.’
Does the state define marriage for you? I doubt if it does. I bet your faith would go with its own definition if the state tried to punish it for not accepting ‘gay marriage’ or some other impossibility the state is calling marriage at the time.
Freegards