Theocracy: a form of government in which a deity is the source from which all authority derives.
1. All Christians want theocracy (properly understood).
2. Theocracy in the sense that the national life - its laws, rules and regulations, customs and habits, social practises - should be at-least compatible-with, and in practise supportive-of, Christian life.
3. The Christian life is (necessarily and always) individual, opt-in and voluntary - but it is susceptible to incentive: positive and negative.
4. So - Although Christianity cannot be enforced upon anybody (and even the attempt should not be made); and despite than any genuinely Christian society will always contain non-Christians (at least in this world) (and probably in a considerable proportion); given that there is a stark choice between either a pro- or an anti-Christian society (a steady-state of neutrality being logically- as well as practically-impossible) - All Christians may be presumed to want a theocracy.
5. Different types of Christian will, presumably, want different types of theocracy. The best known would be the divine monarchy of Byzantium or Holy Russia; or the dual system of Pope and his anointed monarch under spiritual authority; but have also been decentralised and non-episcopal and non-priestly models of theocracy such as Calvin's Geneva and other 'puritan' polities (eg. in New England up to the early 1800s) - and Brigham Young's Prophet-led Mormon republic of Deseret.
6. Many other versions of Christian theocracy are, in principle, possible. But one or another theocracy is the only viable destiny of any possible future Christian society.