Ancient Israel was a monarchy.
Democracy and republicanism originated in pantheistic cultures.
Rome adopted Christianity for the monotheism, as the Empire was rising from the ashes of the Republic. Essentially to validate The Big Guy Rules. Divine right of kings.
When the West went back to democracy and republicanism, it required separation of church and state, culture and civics.
All democracies will remain flawed, until civilization faces the fact that public government and private banking do not work.
As executive and regulatory function, government is the nervous system of the state, while money and banking are blood and the circulation system. As the banks control the finances of anyone running and have less oversight, the only real job the flunkies in office have, is running up the public debt the banks need to grow metastatically. "The real money is in bonds."
As a social contract, money is a medium, like blood, not a store of value, like fat. To store the asset side of the ledger, there has to be a debt to back it.
Thus we have an economic system where the medium is constantly being drained and ever more has to be added, then ever more unstable methods have to be devised, to store the excess.
We are linear, goal oriented creatures in a cyclical, circular, reciprocal, feedback generated reality.
There is no pot of gold at the end of the rainbow. If you get up high enough, rainbows are a circle.