You're presenting a false dichotomy. Islam doesn't say that the world is 6,400 years old, and as far as I'm aware, neither do most followers of Judaism and Christianity believe in that either.
> One thing religions don't do is give up their certitudes in the face of evidence
Which religions? All of them? Did you study each and every one in detail to be able to make such a claim?
> Or prove useful to human existence
Same question.
> abandoned the child
According to Christianity, but not to Islam or Judaism.
A very common fallacy I see by atheists or secularists when these discussions come up is how they group all belief and faith systems into one thing called "religion", then cast the baby out with the bathwater so to speak, not realizing how easily falsifiable some of their claims are, or how they generalize across that which must not be generalized. You don't have to be an expert about "religions", but don't pretend you're one by the implications you're making.
> One thing religions don't do is give up their certitudes in the face of evidence
Which religions? All of them? Did you study each and every one in detail to be able to make such a claim?
> Or prove useful to human existence
Same question.
> abandoned the child
According to Christianity, but not to Islam or Judaism.
A very common fallacy I see by atheists or secularists when these discussions come up is how they group all belief and faith systems into one thing called "religion", then cast the baby out with the bathwater so to speak, not realizing how easily falsifiable some of their claims are, or how they generalize across that which must not be generalized. You don't have to be an expert about "religions", but don't pretend you're one by the implications you're making.