I disagree. Brainwashing can be considered a subset of education, but it is very distinct from, say, a mathematician proving the First Fundamental Theorem of Calculus to her students. Brainwashing involves the deliberate misrepresentation of facts: hiding alternate options, over-emphasising certain facts and under-emphasising others, delibterate repitition, authoritative enforcement, etc.
Science, art, history, etc, if properly done, do not present the facts in a biased way. And I think that's the key word: bias. By forcing young children to pray en masse, they create a bias in the children's mind that Christian prayer is normal and right, and other spiritual activities are bad (Muslim prayer, for instance, or Buddhist meditation). Of course, the zeitgeist marches on and we see more people abhoring enforced prayer and embracing 'aternative' spiritualities.
A mathematical proof isn't brainwashing for unqiue reasons that pertain to the nature of proof. You can't brainwash someone into thinking that 1 + 1 = 2 because you can
prove that 1 + 1 = 2.
I guess my point is that education is not necessarily brainwashing. Informing a child of geological strata is not brainwashing. Telling that it is a 100% proven fact that such strata were formed by a divine Flood (or, indeed, millions of years of sedimentation)
is.
Maths doesn't
On the contrary: children repeating Bible verses with no understanding of what they meant (I remember reciting the Lord's Prayer, and wondering what on Earth a 'trespass' was), and with no interaction with non-Christian literature... I would consider that more sinister than just 'food for thought'.