Kain is a parody on the bible: After killing his brother Abel Cain is sent around the world and also through time. He witnesses the most important scenes in the Old Testament (e.g. Noah building his Arch, Abraham sacrificing Issac, the dance around the Golden Calf etc). But all scenes are seen through the eyes of someone not believing in God's deeds.
José Saramago writes really witty dialogues and after having read the first two chapters I thought that this would be the funniest book I had ever read. It didn't quite stay that all the time but was a very enjoyable read anyway. It clearly made me question certain believes.