An atheist may see teaching a child about God as brainwashing or indoctrination, and a theist might see an atheist as not teaching about God as some kind of indoctrination, as well. I am not saying that I necessarily see it that way, but just that some might.
Wouldn't the parallel be a theist teaching their children that God exists, and an atheist teaching their children that God doesn't exist?
(rather than not teaching them about God...)