I would argue that most children who are told that those things aren't real don't believe it. This reminds of the story of why Disney had to include the magic dust so that Peter Pan could fly.
I am reminded of an episode when my daughter was very young. An overnight stay with an older cousin had left her very afraid of ghosts. Telling her there were no ghosts did not comfort her or allow her to go to sleep easily at night. Spraying her curtains with magical ghost repellent did. She outgrew it, of course, but there was period when she could not be talked out of her belief in ghosts.
Christian, if I may, I think I understand what you getting out and will respond to a few questions for you. Please correct me if I am not answering them in line with your thinking.
No, not really. I am beginning to think your signature is very apt. I think it possible you are not capable of understanding, I did not conclude there is no god from weighing the evidence: it was my default position and nothing has happened to make me change it.
I think that you have indeed met his definition. It doesn't matter what default state you started with. Your current state is due to your giving the matter some thought and coming to a conclusion.
I don't think that Christian wishes to include children too young to have given the matter any thought. I think that he would be perfectly happy to include children who have thought it over and come to a conclusion.
That is more or less in line with my thinking on the matter anyway.
But your criteria are not "objective", you've got a bias built in because your working definition of "atheist" isn't the one that atheists themselves use.
Objective only means that the delineation between who is or is not in the group is not very fuzzy. Objective measurements can be biased, it's not an either/or situation.
Let's try this from another direction. Christian, the word "atheist" simply means "someone who doesn't believe in a god or gods." Why do you feel the need to add anything to this defintion?
I think he does not find that definition useful in terms of his hypothesis. It is too inclusive. I think he does not want to include agnostics (in the uncertain sense) or children too young to have given the matter any consideration in his classification of atheist.
It might be wise for him to alter his hypothesis to reflect that. It sounds like perhaps he didn't realize he needed to add an adjective to get the proper translation for his thoughts.