NT Wright published a neat little book on faith and public life, basically a view of what a Christian politic might look like with the NT book of Acts as a starting point.
Near the end of the book, Wright suggests how God might be at work in the world:
As for power, when people say (as they often do), “Why doesn’t God do something?”, they always seem to assume that if God was really in control he’d send in the tanks and stop the bullies and the unscrupulous getting away with it. But according to the Sermon on the Mount…. when God wants to change the world he doesn’t send in the tanks… he sends the meek, the mourners, the merciful, the hungry-for-justice people, the peacemakers, the incorruptibly pure in heart. That was never a list of qualities you needed to try to work at in order to get into heaven. It was always a list of human characteristics through which God would bring his kingdom on earth as in heaven. That’s how God works. And by the time the bullies and the arrogant have woken up to what’s happening, the meek and the mourners and the merciful have built hospitals and schools; they are looking after the sick and the wounded; they are feeding the hungry and rescuing the helpless; and they are telling the powerful and the vested-interest people that this is what a genuinely human society looks like, thank you very much.