Your Terutz on Noach is a cute Pshetl, but if the Kasha bothers you as it bothered me you would want a real answer as to how you can call someone who worked for 120 years in the face of ridicule and scorn, a Ktan Emuna.
The answer is that he obviously believed in Hashem and His abilities. However, he just couldn’t imagine it would really happen. He figured that in the last minute things would turn out, they’d get another chance, or they’ll all do Teshuva(, or it’ll turn out to be color war). Not unlike the way a child doesn’t take a parent’s threat seriously.