I've thought about this recently, in addition to thinking about this when I read Dawkin's thoughts on this. I've been coming to the conclusion that to say that parents are brainwashing their kids by imparting religion to such an extant to warrant removal would not be......(can't think of quite the right word).....but in essence if we grant that imparting religion is wrong then we must also admit that imparting just about anything is wrong, so being born into the world would be on the same level of wrongness. And that is the contradiction to it. If we want to go so far as to say that teaching a highly impressionable child something that they will retain and believe, is wrong then we must stop them from being taught by anyone and they would have to discover things on their own. That is neither acceptable nor realistically possible, children must be taught certain things, and thus religion will continue to be a part of that.
But also consider that a fundamental part of the Judeo-Christian believe is to "Train a child in the way he should go, and when he is old he will not turn from it." So unless you can convince them that their bible is wrong (and thus their whole religion and then they would have no reason to further impart it) this is a moot discussion and only useful as an exercise in thought, which I still like though.