Upbringing, and brainwashing, are they but sides to the same coin?
There's a quotation by Prophet Mohammad that says: "No babe is born but upon Fitra* (nuetral). It is his parents who make him a Jew or a Christian or a Polytheist." (Sahih Muslim, Book 033, Number 6426)
Also: "Each child is born in a state of "Fitrah*", then his parents make him a Jew, Christian or a Zoroastrian, the way an animal gives birth to a normal offspring. Have you noticed any that were born mutilated?" (Collected by Al-Bukhaaree and Muslim)
* "Fitra", meaning neutrality, naturality, had been interpreted within Muslim schools as the Islamic faith. So, each child is born a Muslim, untill the parents "brain wash him."
Growing under the roof of those interpretations, it is easy not to question the term. Same goes for a country's weather conditions. If it is excissivly hot and dry, people simply avoid the sun, stay in, and turn up the air conditioner. Yet, the minute people step outside their religious and cultural context, the issue of brainwashing surfaces.
For example, when conservative Muslim parents take their children abroad, they are constantly in fear of the other culture altering their children. They grow extra concious of who their children hang out with, what language they are using, where do they go, what do they watch/read, and how keen are they in practicing the religion (prayers, Quraan, etc.) To them, any change in their children's pattern (even if it were due to progression of age, and entry to teenage-hood) is a stage of danger innwhich they are being brainwashed. But by who?
It is one of two things, really.
Either that we are in a time of war, and brainwashing is a weapon used by one party to over power the other. So, the issue is not finding the truth, or following the faith, but simply a struggle of political powers. (objectively speaking: no party is good when it comes to politics.)
Or that the truth exclusively belongs the the Muslims, and they are the ones who are still neutral and unaltered. Meaning, the entire non-muslim world is a bunch of brainwashed, mesmerized people, who are living a big lie, and are going to hell because of their bad parents who also had bad parents who had a truly bad figure in history which caused a chain reaction of disturbed upbringing...