Learing Development: Teaching vs Propaganda

Something came up the other day at Uni.

When we teach we are altering the way people think. Passing our own points of view to other people, as well as broadening peoples perspective, may change their perspective noticably; like propaganda!

When ever we think of propaganda we think bad things like politics and war; mainly lies! But teaching can also be the same.
In a society there are ideals: education would reflect that in order to make the populace a useful members of society. Is that still propaganda? and is it bad? and if not why not?

Maybe if the intensions are moral it's OK, like Priests: they think everyone should worship God etc. Is preaching and/or teaching from the bible religious propaganda? Is that bad?

Again maybe it depends on the intensions: if they really want to help people morally or just make money?