Who get’s to decide what’s Caesar’s and what’s God’s?

Mike Ovey, Principal of Oak Hill Theological College, recently wrote an article on the challenges and contradictions of equality in Britain.  Amongst his wise words is the following,

When it comes to “Render to Caesar the things that are Caesar’s, and to God the things that are God’s, Caesar is taking it on himself to work out which things belong to him and which belong to God.  Not surprisingly, Caesar wants more and more.