There are a lot of problems we, as individual and as a society, faces everyday. Whether it be physically, mentally, environmentally, pyschologically or morally it seems that these problems are inevitable.
The role of the government is to stabilize and provide the basic needs of a citizen including the order and organization among individuals. While the religion is to ensure that faith and morale of the citizens are still in equilibrium with whatever aspect.
In terms of the political issues that arises between the government and the opposition, should the sector of religion interfere with whatever the citizens and the government must decide?
In theory, if a population is comprised entirely of people from one religion, it could be okay for religion to play a big role in politics. I say "in theory" because that it's pretty much impossible without forcing people to be of one religion. Thus, it's better to keep religion and state separate. Governments can consult with religious leaders and try to make sure their followers have the rights and freedoms they deserve, but they shouldn't be making decisions themselves for a whole country.
I understand your proposition, but based on what I see in my country and what the news has been implicitly telling, it seems that the church has hindered so much advancement that the state could've done because of their so-called moral issues and so on. But, thank you for your wonderful opinion!