Well, the PROBLEM I see that your having with the idea is the way that you USE "dis".
Let's take a look at the statement for a sec.
A BABY
DISBELIEVES X BY DEFAULT.
You might find it RIDICULOUS that a baby uses critical thinking ... and I would agree... they pee and poo all over the place. They aren't evaluating TRUTH claims.
BUT...
Don't get caught up playing pedantic
words games.
Nobody is saying that babies are evaluating truth claims of propositions using propositional logic.
What we might be referring to is that ( to our knowledge ) babies DON'T have beliefs in metaphysical beings and have NOT formed opinions on their ontology. Because ( as far as we know ) babies don't DISPLAY knowledge of critical thinking on very obtuse philosophical questions.
We MIGHT infer that BABIES.. ( as far as we know ) don't HAVE metaphysical categories such as "beliefs" and "gods" to begin with.
Notice, please, that the word part
DIS means
a Latin prefix meaning “apart,” “asunder,” “away,” “utterly,” or having a privative, negative, or reversing force (see
de-,
un-2. ); used freely, especially with these latter senses, as an English formative:
disability; disaffirm; disbar; disbelief; discontent; dishearten; dislike; disown.
So, lets look at these words for a minute, using the prefix DIS....
A disability is
NOT an ability.. it's a LACK of an ability.
To disafirm is to
NOT affirm.
To disbar is to
remove someone from the bar. If you have been disbarred you are
NOT on the bar.
A discontent is to
NOT be contented.
To be disheartened means to
NOT be "heartened".
To dislike is
NOT to like.
To disown is to
NOT own.
Notice that every time we use the prefix DIS we mean NOT in some way.. a NEGATION.. a NEGATIVE
And to disbelieve is to
NOT believe.
NOT being the operative word here.
disbelieve and not believe is utterly synonymous.
the baby doesn't HAVE active decision making opportunity as of YET.. that comes a bit later in life.
So, the prefix NOT comes into play as to the acceptance of a truth statement when it comes to BABIES...
Babies, ( as far as we know )
DO NOT have beliefs about ... metaphysical beings and propositional logic.
PLEASE notice the
DO NOT HAVE part of that last sentence.
It's not the SAME as DO HAVE beliefs about metaphysical beings and propositional logic.
DIS = NOT in MOST English dictionaries.
And in MOST English conversations I've ever HAD.
A ROCK disbelieves.. because it does NOT believe. It has NOT the belief in any god. ( afawk )
A rock LACKS a belief in any god.( afawk )
A rock DOES not possess a belief in any god. ( afawk )
Neither does a pre-cognative baby. ( afawk )