What is the significance of the stories about the ship-owner and the religious islanders to Clifford's argument? What is wrong with the actions and beliefs of the shipowner and the agitators in the island? Why is belief important according to Clifford? For Clifford, why is wrongness attributable to a belief (not just an action)? Why is it the case that even uneducated people have the duty to believe according to evidence? For Clifford, is it permissible to believe a true belief without sufficient evidence?