Really? Where was this disproven?
A critical mass of Christians in the society absolutely does change the nature and tone and direction of a society.
If the writer doesn't know this, he needs to get out more.
Furthermore, as our own culture takes its dive into the tarmac, we are finding that politics can't fix what ails us, because politics rests upon a moral foundation that either is or isn't there. And that moral foundation rests upon a spiritual one.
You can have a government that is worse than the people it governs but you will only rarely and briefly have a government that is better than its citizenry. In general, if your government is corrupt your people are as well though they may prefer not to recognize it. This is a moral problem, and this is a spiritual one. Solve that, and the political problem will take care of itself. Fail to solve it and you get to watch while each and every election cycle takes you deeper into disaster.
See my post above. It’s not about imposition of the will of an autocracy on the majority—it’s about the importance of leadership, in EVERY society...even democratic ones.