Was there really such a thing as German resistance to Nazism?

Part 3 of Hans Fallada's great "Every Man Dies Alone" begins with a more explicit statement than elsewhere in the novel about life in Germany in 1940-42 - nobody's safe, everyone's spying on everyone else. The young newly married couple, Trudel and (?), move to the outskirts of Berlin, hoping to live a more private life there and put behind them their activist/socialist past, but it isn't to be - they're under even greater scrutiny in a small town. Trudel goes into Berlin for some shopping and, pure chance, spots the father of her former fiance (who died in the war), Otto Quangel - she catches him in the act of distributing his anonymous anti-Fuhrer post cards, which is more than the Gestapo has been able to do in two years. He warns her never to speak of him, even to her husband - he's cold, and obviously a damaged and disturbed man. Menwhile her husband comes across an old comrade who berates him for trying to be apolitical. Somewhat shamed, he agrees to hold a suitcase, which he stashes in the train station luggage room. Something will happen there for sure. He keeps this secret from Trudel. So what we have set up is a very odd picture of society. We imagine - is it true? - that the German citizens blithely went along with Nazi terrorism, either actively supporting it or willfully ignorant and indifferent. This novel suggests otherwise - that there was quite an active, if ineffective, resistance. It also implies that very few Germans actively supported the regime - hard to believe, really. But it's not an apologia for Germany - in a way, it makes the horrors even worse - an entire civilization living in fear and terror of a tiny but brutal leadership. But why couldn't all of these Germans have done something to stop Nazism? It's a strange book - the Jews hardly mentioned - and I wonder how accurate, and how much the product of one fervid imagination.