noun

heresy

HAIR-uh-see/ˈherəsi/

A belief or opinion sharply opposed to accepted religious teachings or prevailing views.

The church regards his rejection of its central teachings as heresy.

In historical religious council, one member presents a different geometric doctrine symbol on tablet while council holds matching contrary symbols, sober disagreement, no text.

Etymology

Greek hairesis connected choosing with a chosen school of thought or sect. Christian usage narrowed this to an unorthodox sect or doctrine, which underlies the broader sense of an opinion contrary to accepted standards.

In context

Pastor Allen Nolan5:19

you can believe something that's considered to be heterodoxy but it's not heresy so what is heresy heresy is a belief or an opinion that's profoundly at odds with what's generally accepted as truth

Orthodoxy, Heterodoxy and Heresy: What's the Difference? Pastor Allen Nolan Explains

More examples

The council condemns several teachings as heresies.
Questioning the founder's strategy amounts to heresy within the company.
In our family, putting ketchup on eggs is heresy.

Forms

heresy · heresies

heretic noun — A person who rejects accepted religious teachings.

heretical adjective — Contrary to accepted religious teachings or views.

Similar words

heterodoxy: Names departure from orthodoxy without necessarily implying serious condemnation.
dissent: Emphasizes expressed disagreement rather than a belief condemned as false.