I don’t expect professing Atheists to agree. However there is, to a degree, a sense of abuse — in the ultimate sense — in teaching children that God doesn’t exist. Mind you, I don’t consider it abuse because (which) God’s existence is obvious, though I believe it is. It’s because atheism inoculates the child from the only possible means of salvation — if indeed we need it.
Here I am invoking Pascal’s Wager after a fashion, but not even to the extent where Atheist parents should be teaching their children that God exists. If there is a responsible view non-believing parents should be instilling in their children, it is agnosticism. At least in teaching agnosticism, the child would not have the bias against theism that atheism erects and investigation with a more open mind that atheism doesn’t allow for is possible.