HERESY

[noun] - (the act of having) an opinion or belief that is the opposite of or against what is the official or popular opinion, or an action which shows that you have no respect for the official opinionRadical remarks like this amount to heresy in the far-right Republican party. [U]She committed the heresy of playing a Madonna song on a classical music station. [C]Heresy is also a belief which is against the principles of a particular religion.He was burned at the stake in the fifteenth century for heresy.