I hear that there is a saying in the Catholic Church (maybe from the Jesuits) that says "Give me a child till he is 7 and we will give you a Catholic" or something like that.
There certainly is an element of brainwashing in it but I know from experience with myself and my class mates in the Catholic education system that we make up our own minds. Maybe it was the era I grew up in to an extent.
Most parents with strong religious beliefs probably want their children to believe the same. If that is stopped (and I am not sure how that would be enforced) then it is one belief system forcing their ideas onto other belief systems and their adherents. It's the same thing that you seem to want to put a stop to. Sounds like an atheist plot to rid the world of religion
while at the same time wanting to look like it is doing something fair and good and maybe even scientifically sound.
Some parents, such as my daughters, who are not believers, bring up their children with more of an open mind, but whether their minds are truly open in a system that ignores religious belief to an extent as if it is not important (I'm in Australia) is another matter. But I'm sure my grand kids will also make up their own minds in the end.