Well, my many explicit criticisms of new atheism and of secular society might also have tipped you off that I'm not stuck at least in a conventional confirmation bias. My thinking isn't so tribal, or at least it's not connected to any currently dominant tribe.
I haven't read that book, but Niebuhr's "Christian realism" strikes me as oxymoronic. It's more realistic (and secular) than Christian, and it's one of Christendom's many rationalizations for turning away from Jesus's radical counterculture. I see virtually no concessions to realism in the New Testament because the earliest Christians assumed the world was about to end, so there was no need for realistic thinking about how to sustain a Christian infrastructure. All the rest in official Church doctrine is hypocritical compromise.
Niebuhr's realist spin on Christianity was also very useful to the American political establishment. He's closer to the grand inquisitor than to Jesus, in Dostoevsky's poem.
