Don't you realize the absurdity of that statement. You disagree with what they wrote, and then call them illiterate. While illiterate can merely mean ignorant, it is most commonly understood to mean the inability to read or write.
Their history was oral. Doesn't make it any the worse as a history - nor any less divinely inspired for many years of being passed down word-of-mouth before it was first written.
Heck - They had not yet invented the “zero” - so how do you expect them to keep track of decimal places and powers of ten?
But their entire SEQUENCE of events describes what we only now know. And THAT is the miracle of Genesis.