The main difference between indoctrination and education

 The main difference between indoctrination and education

Is the factual nature of what is being transmitted...

Especially when lies, half-truths or distortions of facts, typically organized as dogmatic narratives, predominate or are already present from the very essence of a belief system, it is safe to classify it as very likely to serve as an ideological reference for indoctrination, and not for education.

That is why, affirming that God is a very possible logical improbability and that the class struggle is an empirical reality, are not examples of ideological indoctrination (the first, in fact, lacks any evidence, and the second is visible at any time in a typical human society), while denying them, are examples (on the "right") of indoctrination.

Any denial of a fact, especially a notorious fact that can be easily observed, or affirmation of an extraordinary phenomenon or event without any true evidence to corroborate it, are raw material for indoctrination.

Two other examples of indoctrination, and not education, but which are further "to the left" on the political-ideological spectrum are: the denial of the existence of more intrinsic differences in behavior and intelligence between individuals and human groups (observable and ratified by the perception of patterns of stability, predictability and heredity of behaviors), and the extraordinary assertion (a typical complement to the first) that the environment plays a much more important role in human behavior than our own nature or biology, as if we were merely reagents totally moldable by circumstances.