moralism

(derogatory, often, uncountable, usually) The act or practice of moralizing (making moral reflections or judging the morality of others).
(countable, derogatory, often, usually) A maxim or saying believed by the speaker to embody a moral truth; an instance of moralizing.
(dated, uncountable, usually) Religious practice that focuses on morality while placing little emphasis on doctrine or the metaphysical; adherence to a system of morality with little or no reference to religion.