Hi pescador,
Right! I've heard that a lot but other than anecdotal evidence I haven't had anyone provide any hard facts that might give proof of such a claim.
For example, one has posted here that many Romans were slaves and slaves don't learn to read or write. Says who? Is that understanding merely 'derived' from what we know of slave culture in America in the 1800's? I think that what we know today about the real life of a slave in the days of early Israel, Egypt or Rome may actually have been quite different from our personal observations of slavery in the 1800's in America.
So, I'm perfectly willing to investigate your claim, but unfortunately a thorough investigation would require more than just your say so. What evidence, real hard 'here's proof from those days' that slaves generally weren't given a basic education of the written medium used in that culture in that day, proof?
Now, you do mention 'levels' of literacy. Yea, I can imagine that they all couldn't read and write the prose of Socrates or some few very learned men, but I happen to know a lot of people now who didn't complete high school and can handle basic reading.
God bless you.
In Christ, Ted