Jesus's statement 'Give to Caesar what is Caesar's, and to God what is God's' might be better translated, 'But give to God what is God's'. Jesus is not saying they can be separate, but that the more important questions that are we 'paying tax to Caesar' is are we paying our due ('tax') to God? Of course God does not force us like the Caesar of the world to pay our due, we are invited to do it voluntarily out of Love. This Gospel has more to say also. The image of a coin with Caesar's image is meant to call to mind in whose Image we are Made, and let that image be our highest standard, so that it may transform the world, not the world transform us.