Dearie Me,
Man!! you would thought Rose had just posted real scientific evidence of God.
I would suggest various posters read it again without their atheist vests on
Gonnagle.
Nope reading this with my scientific research and evidence 'vest' on. It's what I do as a profession and that world is full of 'models' that end up not supported by the evidence and being unable to predict what we see in the real world. This would appear to be a case in point.
If their notion was correct we'd see loads of kids from non religious households ending up religious as adults. But we don't.
I suspect they are looking at developmental stages too narrowly. So to give an analogy, there is a developmental stage where kids think that if they can't see you, you can't see them. Is this a 'default' - no, merely a specific point in development an understanding the world. And one that is rapidly overtaken by a recognition that others can potentially see them when the child has his or her eyes closed. It is a key point in development of empathic behaviour - being able to see things through the eyes of other (kind of literally in this case).
Humans as a species are both intelligent and inquisitive, so there may well be a default to understand the world around us, and sure at a particular stage that might result in a common conclusion of something that made it. But this isn't a fundamental default, because later (without specifically be taught that religion is correct) most kids develop a non religious outlook therefore the inquisitiveness has taken a more sophisticated turn with increased cognitive development to recognise that religion isn't needed to explain the world.