Which of the systems of government claims to be a form of government that supposedly uses a system of laws and administrative practices that are in keeping with the will of a Supreme Being?
Check this site for your answer.
http://www.newadvent.org/cathen/14568a.htm
I think what you are looking for is a "theocracy". This site will give you more information.
http://en.wikipedia.org/wiki/Theocracy
Yes, you are correct! The system of government that claims to be in line with the will of a Supreme Being is called a theocracy. A theocracy is a form of government where religious leaders hold the ultimate authority and claim to govern on behalf of a deity or a divine power. The laws and administrative practices are based on religious doctrines and are believed to align with the will of the Supreme Being.
If you want more information about theocracy, you can visit the website mentioned: http://www.newadvent.org/cathen/14568a.htm. This website provides information from a Catholic perspective. Additionally, you can also refer to this Wikipedia link - http://en.wikipedia.org/wiki/Theocracy - for a general overview of theocracy and its different forms.