Reason Not The Only Source of Knowledge

I agree that a belief in god is mystical, but I disagree that the fact that god doesn't exist must be blatant and that believing in god must necessarily involve some dishonest refusal to look into the matter. Or, perhaps to be more precise: The refusal to look into the matter could be a result of genuine disinterest in the light of more pressing problems, rather than some irrational fear response to changing one's mind on the topic.

Perhaps consider a child growing up on a medieval farm in Europe. His entire social context is certain of the existence of god, the kid would never encounter any criticism of it without creating it himself. Water is wet, fire is hot and the universe was created by sky daddy. He didn't ask for this last "fact", it's just what mom and dad told him. He's young, he doesn't really care, he's much more interested in a thousand other things, so he heard of god once, thought to himself "alright, whatever" and went straight back to wondering about whether the dirt in the yard could possibly make for a tasty meal. Perhaps if this kid was to encounter some argument for why the universe cannot have been created by an omnipotent being, the child would just say "ah alright, now that you say it that way, it does sound a bit silly..." and upon examining the matter critically for a mere second the kid would ditch his belief in god without further ado. The reason why he hasn't done so is because he was occupied with things other than the big questions of the origins of the cosmos, the meaning of life and what not. Is this kids belief in god irrational?