CS Lewis and the Social Gospel?

From Mere Christianity,

‘Niceness’–wholesome, integrated personality–is an excellent thing. We must try by every medical, educational, economic, and political means in our power to produce a world where as many people as possible grow up ‘nice’; just as we must try to produce a world where all have plenty to eat.

But we must not suppose that even if we succeeded in making everyone nice we should have saved their souls. A world of nice people, content in their own niceness, looking no further, turned away from God, would be just as desperately in need of salvation as a miserable world–and might even be more difficult to save.

It is a good thing that truly nothing is impossible with God or else none of us would escape His wrath…