This works both ways. Kind of difficult to avoid interacting with "Caesar" unless you're completely off the grid. Jesus wasn't advocating living off the grid either...he was cleverly avoiding a trap that questioner was trying to set; establishing how one can live as a Godly person in a government ran by men.
See Post #19.
Without a civil marriage license you have to hope your spouse has a will for themselves, never has to be put on life support, or never commits a crime that you know about.
As an aside, I know that France's anti-clerical stance was big during Napoleon's rein. Has it continued, from a legal stance, ever since, or was their a period in which that was reversed? Anyone out there know for sure?