The lesson is not to conflate things of the spiritual world with the material world, because the result is inevitably profane.
Christianity doesn't fix the world as much as tolerate it as a proving ground for the next. I know, not what you want to hear and alarmingly passive, which is why it is always dismissed until it can't be.
You can't make the world better, but you can try be better. And if everyone tries to be better, the world is better. Force it and you have rebellion.