The prince's official job description as king will be 'defender of the faith,' which currently means the state-financed absurdity of the Anglican Church, but he has more than once said publicly that he wants to be anointed as defender of all faiths—another indication of the amazing conceit he has developed in six decades of performing the only job allowed him by the hereditary principle: that of waiting for his mother to expire.
This is what you get when you found a political system on the family values of Henry VIII. At a point in the not-too-remote future, the stout heart of Queen Elizabeth II will cease to beat. At that precise moment, her firstborn son will become head of state, head of the armed forces, and head of the Church of England. In strict constitutional terms, this ought not to matter much. The English monarchy, as has been said, reigns but does not rule. From the aesthetic point of view it will matter a bit, because the prospect of a morose bat-eared and chinless man, prematurely aged, and with the most abysmal taste in royal consorts, is a distinctly lowering one.