In religious context, a sacrilege is an action that is counter to fundamental beliefs or traditions of the Church; for example, putting out ghoulish Halloween decorations for Christmas, or otherwise mocking or disrespecting the religion through actions. 

Blasphemy is similar, but it connotes speech; blaspheming is saying something unclean, insulting or disrespectful to God or in his presence; cursing in church and talking to the sky with a "bring it on" attitude are traditional examples of blasphemy.

The term that probably best describes what you did is "heresy", which is to express thought or belief that is contrary to church doctrine. By saying that sweet peppers can be mixed with hot peppers to tame the heat of chili, you contradict the beliefs of chili "fundamentalists" who think that only various hot peppers (and derived ingredients like chili powder) should be added to chili. To actually *do* what you have said would be sacrilege.